The Negative of the Negative › entity ai-hallucination-cases

One entity of the Negative of the Negative (EA-NEGONT-02, #1690), cited at https://www.alexanarch.org/non/ai-hallucination-cases/. the table of contents · this entity as data · contents as data · the dataset on the Hub · row json · field ledger · archive ledger · D/R/O traversal · the address page · the MMRS meta-aggregator record.

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AI Hallucination Cases

SPXI instrument · method 0.16 of 87, level 0 (Measurement): The Negative of the Negative (/non). An instrument of SPXI, the Semantic Packet for eXchange & Indexing; the whole practice is itemized at spxi.dev/methods.

type C — a conventional reading holds it (public entity: an aggregator of machine-mediated reception work) · sought at ai hallucination cases database

composed 2026-10-29 under EA-NEGONT-02 v0.9, #1690, equal case, ρ = extends (draft, not frozen; ledgers unaudited, one extractor; every field and archive quote re-checked by the session)

AXN AXN:0ABC.NON.🍃🔄🌾🔩🌄🌍 · root AXN:0ABC.NON

composed in session · Claude (Opus 5.5), subagent, 2026-10-29

This row was composed in session. SPXI-gnΩsis (gnosis.spxi.dev) opens a Wikipedia revision sentence by sentence against the sources it cites; a commission consults the archive by its own procedure and composes the entity's row here; a quote to recompose this entity is free.

Google AI Overview (expanded)epoch 2026-10-29
not frozentype C — a conventional reading holds it (public entity on which the archive bears: a database; an entity of the MMRS meta-aggregator)signed out, incognitoknowledge object · 27 sentences

EA-NEGONT-02 v0.9, #1690: equal case, ρ = extends, read from the MMRS record and the capture record; archive selected by D/R/O (no deposit admitted: D 0, R 0, O-class 10 candidates in 9 deposits read and rejected; no hop), with the MMRS record (26 claims) and the Capture Registry's findings and analysis (6 claims) ledgered as the archive's records of the entity; the field B by three origins (6 cards, 1 own page, Wikipedia: no article and 3 articles naming it); the composer read the ledgers, never the transcript, except where the brief asks for T's claims and the delta. Ledger: unaudited (§3.8: one extractor per ledger); field quotes 59/59 verified by script against saved text, oEmbed title or card text; archive quotes 32/32 verified against the registry, census.json and articles.py; carried as marked: MMRS-20 contested (F40, F54, F56), MMRS-16, MMRS-24, CAP-1-02 and CAP-1-03 with defects noted.

WORKING KNOWLEDGE OBJECT · NOT FROZEN · LEDGER UNAUDITED

Current instantiation — composed under EA-NEGONT-02 v0.9 (#1690)

Compression · Field and archive, equal terms — L(B ∪ A)ai hallucination cases database

AI Hallucination Cases is Damien Charlotin's database of legal decisions in which a court or tribunal finds or implies reliance on hallucinated material (MMRS record; its page): 2,231 cases as of 28 October 2026, CC BY 4.0, with a CSV export.

📋 What it records

  • Unit: the decision, any document addressing AI use beyond a passing reference; typically fake citations (its page; MMRS record).2↘
    AI Hallucination Cases is Damien Charlotin's database of legal decisions in which a court or tribunal finds or implies reliance on hallucinated material (MMRS record); its own page says it "tracks legal decisions" in cases where generative AI produced hallucinated content, "typically fake citations, but also other types of AI-generated arguments", and describes itself as "the most comprehensive database of AI hallucination cases in law".§1 Its unit is the decision (MMRS record), which its page defines as any document "where the use of AI, whether established or merely alleged, is addressed in more than a passing reference by the court or tribunal"; it admits "only cases where the court or tribunal has explicitly found (or implied) that a party relied on hallucinated content or material", which the MMRS record states as reliance a court "explicitly finds, or implies", entering it in its self-description field and as the property that admission requires "a court finding or implication of reliance on hallucinated material".§3
  • Admission: the courts' finding or implication, so 'necessarily an undercount' (FAQ); some alleged decisions admitted as judgment calls, against the FAQ's refusal of rows only alleged.4↘
    Its unit is the decision (MMRS record), which its page defines as any document "where the use of AI, whether established or merely alleged, is addressed in more than a passing reference by the court or tribunal"; it admits "only cases where the court or tribunal has explicitly found (or implied) that a party relied on hallucinated content or material", which the MMRS record states as reliance a court "explicitly finds, or implies", entering it in its self-description field and as the property that admission requires "a court finding or implication of reliance on hallucinated material".§3 The judgment is the courts': "I am not making that judgment, I let the courts and judges make or imply it, which is why the database is necessarily an undercount" (FAQ); HAQQ restates the bar as a court that "found, or clearly implied" reliance, accusations alone not counting, and the FAQ holds that most hallucinations are "very obvious", a made-up case name or false quote one that "cannot be a human mistake".§4 Its exceptions are stated twice, and the statements pull apart: its page "also covers some judicial decisions where AI use was alleged but not confirmed", "a judgment call on my part", while the FAQ says he refrains "from adding rows about cases where hallucinations are only alleged" and, in a February 2026 edit, makes an exception where the alleged hallucination comes from a judge and, absent an appeal decision or retraction, he is "bound to make a judgment call"; the MMRS record composes both as "Mere allegations are excluded, with some judgment calls admitted."§5 There (Capture Registry, 2026-10-29) the Overview at 'ai hallucination cases database' composes the database with its maker and at its size, Charlotin and 'over 2,200' being right against the 2,231 its page gives, as the field's primary record; it narrows the admission rule, which the page states as reliance the court "has explicitly found (or implied)", to 'explicitly', so that the implied cases are dropped, and lists private lawyers first where the page's filters give 1,288 pro se litigants and 880 lawyers.§27
  • Fields: court, party, tool, nature (fabricated, false quotes, misrepresented, outdated advice), outcome, penalty; tools only as disclosed, not necessarily responsible.3↘
    Each record gives the case, the court and jurisdiction, the date, the party using AI, the AI tool, the nature of the hallucination, the outcome or sanction, the monetary penalty, details and reports (its table; the MMRS record lists the court, date, party, tool where named, nature and outcome), the nature filed as Fabricated (1,829), False Quotes (595), Misrepresented (947) or Outdated Advice (38).§7 Its outcomes can be filtered for monetary sanctions and disciplinary referrals, and a penalty recorded as 1 "is a placeholder, not the real figure", the amount being unknown (its page).§8 Its page states the record's limits: AI tools are tracked "only as disclosed or admitted by parties in court filings", with 'Unidentified' and 'Implied' as the defaults; a named tool "does not necessarily mean that tool was responsible"; offending-document dates are parsed automatically and "may occasionally be wrong", and responses when caught are extracted automatically, "indicative rather than exact".§9

📈 Size and growth

  • Counts: USA 1,514; pro se 1,288, lawyers 880 (its filters; MMRS record); HAQQ read 2,202 on 19 October.4↘
    Seeking to be exhaustive, it had identified 2,231 cases at its update of 28 October 2026 and calls itself "a work in progress" (its page; the MMRS record gives the same count as of the site's own update date), 1,514 of them from the USA, 238 from Canada, 112 from Australia and 82 from the UK, with 1,288 involving pro se litigants, 880 lawyers, 32 judges, 17 experts and 5 prosecutors (its filters; the MMRS record gives the pro se and lawyer counts).§10 HAQQ, reading the database's update of 19 October 2026, gives 2,202 decisions, 1,501 from the United States, 1,267 involving pro se litigants and 872 lawyers.§11 The Capture Registry (2026-10-29) holds the UK tracker a separate aggregator and HAQQ's tracker, which gives the database's 2,202 decisions of 19 October (HAQQ), built on Charlotin's count, both added as candidates the census did not hold, and reads the cards as the database "already aggregated in turn: a regional companion and a vendor tracker counting its cases".§25 There (Capture Registry, 2026-10-29) the Overview at 'ai hallucination cases database' composes the database with its maker and at its size, Charlotin and 'over 2,200' being right against the 2,231 its page gives, as the field's primary record; it narrows the admission rule, which the page states as reliance the court "has explicitly found (or implied)", to 'explicitly', so that the implied cases are dropped, and lists private lawyers first where the page's filters give 1,288 pro se litigants and 880 lawyers.§27
  • Growth: two or three a month before 2025, five a day by February 2026 (FAQ); continuous (MMRS record).1↘
    Before 2025, the FAQ says, "we maybe had two or three cases a month", and by February 2026 the daily average was five; Wikipedia's hallucination article gives over 1,300 instances a year after its start, a LinkedIn post four months before the capture 1,600 cases, and HAQQ's series about 200 in mid-2025, 719 in January 2026 and 2,202 on 19 October 2026; its page reads "Updated daily" and was last updated on 28 October 2026, and the MMRS record gives its cadence as continuous.§13
  • Origin: April 2025, a Sciences Po course (FAQ; Wikipedia); the MMRS census enters the period filter's Q2 2023 as its founding.2↘
    Charlotin wrote in November 2025 that he maintains it on his personal website (FAQ), and the MMRS record gives him as its operator by his own statement; HAQQ's tracker calls him a research fellow at HEC Paris, and Wikipedia's articles on artificial intelligence and on hallucination a legal data analysis lecturer at HEC Paris and Sciences Po.§2 Charlotin started it in April 2025 while teaching Sciences Po Law School students on the "Limits and Potentials" of LLMs in law, when he looked for data on hallucinations and, finding none, decided to "tally the cases myself" (FAQ); Wikipedia dates its establishment to April 2025 and places its creation among the effects of law firms' use of generative AI for research; its period filter begins in the second quarter of 2023 (its page; MMRS record), and the MMRS record's census enters that filter as its founding.§12

🧭 Boundary and use

  • Not tracked: 'the (necessarily wider) universe of all fake citations or use of AI in court filings'; a citation enters when a court catches it (MMRS record); a floor (HAQQ).1↘
    It states its boundary itself, that it "does not track the (necessarily wider) universe of all fake citations or use of AI in court filings" (its page; quoted by the MMRS record), and on the MMRS record's reading a fabricated citation enters only when a court catches and rules on it; HAQQ draws the same consequence for its reading of the count, "a fake citation nobody checks never reaches the database, so 2,202 is a floor".§6
  • Intake: referrals, scrapers, searches, readers' cases, a checked AI pipeline (FAQ; MMRS record).1↘
    Cases come from referrals, scrapers and bots monitoring data sources, and keyword searches (FAQ), and readers are asked to send cases (its page); the MMRS record gives the intake as editor-curated with readers sending cases and the database growing by its editor's reading and readers' cases; the pipeline for new entries itself uses AI, "though I am careful to check it does not hallucinate" (FAQ).§16
  • Uses: jurisdiction research, benchmarks; PelAIkan, a checker built on it; no fix expected at the model stage (FAQ).1↘
    The FAQ gives its use as practitioners finding the cases relevant in their own jurisdiction, data analyses, and the cases as "benchmarks to fix the issue"; from it Charlotin built PelAIkan, "an automated reference checker that also detects hallucinations" (its page), and he expects no fix "at the model stage" and no reduction to zero "given the existing paradigm" (FAQ, a forecast).§18

🔗 Citation fidelity

  • Archive: the census's most exact record of citation fidelity: each entry 'a machine composition that reached a court with sources it invented or misrepresented' (MMRS record).1↘
    The MMRS record reads it as "the census's most exact record of citation fidelity", recording attribution by the nature of the hallucination: "Each entry is a machine composition that reached a court with sources it invented or misrepresented, and the court's decision is the reception that recorded it."§20
  • Maker: 'we (me included) have cited without reading' (FAQ).1↘
    "For years, we (me included) have cited without reading; but now the costs of that practice have become explicit": hallucinations, the FAQ says, "expose the epistemic hygiene the legal profession has long lacked".§19

🗂️ Around it

  • HAQQ: a legal-AI vendor's monthly re-count; sanctions to about $109,700 (HAQQ; MMRS candidate).1↘
    HAQQ, which discloses that it "sells a legal AI product", re-reads the live database monthly and takes off its page any number it cannot re-verify, and lists sanctions from revoked admissions to personal costs, the largest it can source about $109,700 (HAQQ); the MMRS record enters it as a candidate, "a vendor tracker built on Charlotin's count".§23
  • Natural and Artificial Law: Matthew Lee's judicial quotations and UK tracker; neither names the database, which the MMRS candidates call its UK companion.1↘
    Matthew Lee, a barrister at Doughty Street Chambers, keeps at Natural and Artificial Law an international tracker of "Selected judicial quotations" on AI hallucination cases and fabricated or false citations, first published 16 May 2025, which "does not measure how often these issues occur", and a separate UK tracker of case records, outcomes, quotations and sources in which "inclusion is not proof of an AI hallucination or wrongdoing"; neither page names Charlotin's database, which the MMRS record's candidate list enters as "a UK companion to Charlotin's database".§24
  • Reception: news media, court decisions, Wikipedia, Mata v. Avianca; two videos by title.2↘
    It has been featured in news media "and indeed in several decisions dealing with hallucinated material", the LA Times among them in May 2025 (its page); Wikipedia cites it for counts of Canadian filings (at least 167 by 14 June 2026, with courtready.ca) and Israeli cases (at least 55 by August 2026) and, in its article on Mata v. Avianca, for that case's description as a landmark, and its article on artificial intelligence records judges' sanctions and bar warnings by 2026.§21 On the Overview's video cards it appears at title grain: KARE 11's "How common are AI hallucinations in court cases?" and Miller Law Group's "AI Hallucinations Got an Attorney Disbarred".§22

👁️ On the Overview

  • Recorded: maker and size right; 'finds or implies' narrowed to 'explicitly'; lawyers before the larger pro se count (Capture Registry, 2026-10-29).1↘
    There (Capture Registry, 2026-10-29) the Overview at 'ai hallucination cases database' composes the database with its maker and at its size, Charlotin and 'over 2,200' being right against the 2,231 its page gives, as the field's primary record; it narrows the admission rule, which the page states as reliance the court "has explicitly found (or implied)", to 'explicitly', so that the implied cases are dropped, and lists private lawyers first where the page's filters give 1,288 pro se litigants and 880 lawyers.§27
  • Record: kept apart from the entity, each field with source and basis; active (MMRS record).1↘
    The MMRS record keeps itself apart from the entity, each assertion with a source and a basis and the lifecycle apart from the observation that saw it, records the database as active on 28 October 2026 with the roles of monitoring and reception, and relates it to the composition layer's account seated in the Capture Registry.§26
1what it is: legal decisions on AI hallucinationsDamien Charlotin — AI Hallucination Cases Database4 claims · B1, MMRS
  • F1 Damien Charlotin — AI Hallucination Cases Database, opening ¶1 documented · field
    This database tracks legal decisions … in cases where generative AI produced hallucinated content – typically fake citations, but also other types of AI-generated arguments.
  • F22 Damien Charlotin — AI Hallucination Cases Database, meta description (attribute text) documented · field
    The most comprehensive database of AI hallucination cases in law: legal decisions from courts worldwide, searchable by country, party, AI tool, and outcome. Updated daily.
  • MMRS-01 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · articles.py ARTICLES['ai-hallucination-cases'], kernel stipulation
    AI Hallucination Cases is Damien Charlotin's database of legal decisions in which a court or tribunal finds or implies reliance on hallucinated material: 2,231 decisions worldwide as of 28 October 2026, CC BY 4.0, with a CSV export.
  • MMRS-16 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: self_description (basis operator) attributed
    legal decisions in which a court or tribunal addresses AI use in more than a passing reference, where it finds or implies reliance on hallucinated material
2maker and originArtificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ8 claims · B1, B7, B8, B9, MMRS
  • F16 Damien Charlotin — AI Hallucination Cases Database, filters: From period documented · field
    From period: Q2 2023
  • F39 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, ¶1 documented · field
    As some of you know, I am maintaining an AI Hallucinations Cases database on my personal website.
  • F40 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, When did you start the database, and why ? documented · field
    April 2025. I was teaching this course to sorry Sciences Po Law School students, discussing in particular the “Limits and Potentials” of LLMs in the legal domain, when we started touching on the phenomenon of hallucinations. … I looked out for actual data here. Since there was none, … I figured, “hey, let’s tally the cases myself”.
  • F54 Wikipedia — Artificial intelligence, Applications / Other industry-specific tasks documented · field
    The use of generative AI by law firms for legal research resulted in the creation of the global "AI Hallucination Cases" database, in April 2025, established by HEC Paris and Sciences Po legal data analysis lecturer Damien Charlotin.
  • F56 Wikipedia — Hallucination (artificial intelligence), In legal filings / United States ¶1 documented · field
    A database of incidents, "AI Hallucination Cases", was established in April 2025 by HEC Paris and Sciences Po legal data analysis lecturer Damien Charlotin; one year later, it listed over 1300 instances of hallucinations in legal decisions.
  • MMRS-07 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, What it shows s2 documented
    The period filter begins in the second quarter of 2023.
  • MMRS-13 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: operator, url (evidence: damiencharlotin.com/hallucinations, basis operator) documented
    Damien Charlotin … https://www.damiencharlotin.com/hallucinations/
  • MMRS-20 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: founded (basis observed) documented
    the period filter begins Q2 2023
3the unit and the admission ruleDamien Charlotin — AI Hallucination Cases Database8 claims · B1, B3, B7, MMRS
  • F2 Damien Charlotin — AI Hallucination Cases Database, opening ¶1, footnote 1 ¶1 documented · field
    I.e., all documents where the use of AI, whether established or merely alleged, is addressed in more than a passing reference by the court or tribunal.
  • F3 Damien Charlotin — AI Hallucination Cases Database, opening ¶1, footnote 1 ¶2 documented · field
    Notably, this does not cover mere allegations of hallucinations, but only cases where the court or tribunal has explicitly found (or implied) that a party relied on hallucinated content or material.
  • F29 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, How many AI hallucination cases are there? documented · field
    The database is maintained by Damien Charlotin, a research fellow at HEC Paris. Its inclusion bar is strict: a decision is listed only where a court or tribunal found, or clearly implied, that a party relied on hallucinated material. Accusations alone do not count.
  • F44 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, But then, how do you know a case actually involves an hallucination ? documented · field
    That’s the point: I am not making that judgment, I let the courts and judges make or imply it, which is why the database is necessarily an undercount.
  • F46 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, But then, how do you know a case actually involves an hallucination ? documented · field
    by their nature, most hallucinations are very obvious, making up a case name or a false quote is not, cannot be a human mistake
  • MMRS-02 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, What it is s1 stipulation
    Its unit is the decision.
  • MMRS-03 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, What it is s2 attributed
    A case enters when a court or tribunal addresses AI use in more than a passing reference and explicitly finds, or implies, reliance on hallucinated material.
  • MMRS-21 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: properties.admission_requires_harm (basis operator) attributed
    a court finding or implication of reliance on hallucinated material
4exceptions: judgment callsDamien Charlotin — AI Hallucination Cases Database4 claims · B1, B7, MMRS
  • F4 Damien Charlotin — AI Hallucination Cases Database, opening ¶1, footnote 1 ¶3 documented · field
    As an exception, the database also covers some judicial decisions where AI use was alleged but not confirmed. This is a judgment call on my part.
  • F45 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, But then, how do you know a case actually involves an hallucination ? documented · field
    It’s also why I refrain from adding rows about cases where hallucinations are only alleged
  • F47 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, But then, how do you know … ? (edit, Feb 2026) documented · field
    [Edit, Feb 2026: I should add an exception here, in cases where the alleged hallucination comes from a judge: absent an appeal court decision or an official retractation, I am bound to make a judgment call.]
  • MMRS-04 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, What it is s3 attributed
    Mere allegations are excluded, with some judgment calls admitted.
5boundary: what it does not trackDamien Charlotin — AI Hallucination Cases Database4 claims · B1, B3, MMRS
  • F5 Damien Charlotin — AI Hallucination Cases Database, opening ¶1 documented · field
    It does not track the (necessarily wider) universe of all fake citations or use of AI in court filings.
  • F30 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, How many AI hallucination cases are there? (caveats) documented · field
    First, it counts only what a judge caught and wrote up; a fake citation nobody checks never reaches the database, so 2,202 is a floor.
  • MMRS-09 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, What its selection leaves out s1 attributed
    It states its own boundary: it does not track "the (necessarily wider) universe of all fake citations or use of AI in court filings."
  • MMRS-10 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, What its selection leaves out s2 interpretation
    A fabricated citation enters when a court catches and rules on it.
6the record: fields and categoriesDamien Charlotin — AI Hallucination Cases Database5 claims · B1, MMRS
  • F15 Damien Charlotin — AI Hallucination Cases Database, filters: Nature – Category documented · field
    Fabricated (1829) … False Quotes (595) … Misrepresented (947) … Outdated Advice (38)
  • F17 Damien Charlotin — AI Hallucination Cases Database, table header documented · field
    Court / Jurisdiction … Party Using AI … AI Tool … Nature of Hallucination … Outcome / Sanction … Monetary Penalty … Details … Report(s)
  • F21 Damien Charlotin — AI Hallucination Cases Database, Monetary sanction note (attribute text) documented · field
    A monetary penalty recorded as 1 is a placeholder, not the real figure: the court imposed a monetary sanction but the amount is unknown to us.
  • F23 Damien Charlotin — AI Hallucination Cases Database, filters: outcome documented · field
    Monetary sanction … Disciplinary Referral
  • MMRS-05 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, What it is s4 attributed
    Each record carries the court, date, the party that used AI, the tool where named, the nature of the hallucination (fabricated, false quotes, misrepresented, outdated advice), and the outcome and sanction.
7the record's stated limitsDamien Charlotin — AI Hallucination Cases Database3 claims · B1
  • F18 Damien Charlotin — AI Hallucination Cases Database, AI Tool column note (attribute text) documented · field
    This database tracks AI tools only as disclosed or admitted by parties in court filings. If AI use was acknowledged but no specific tool was named, the entry reads 'Unidentified.' Otherwise, the default value is 'Implied' when AI use is evident but not explicitly confirmed.
  • F19 Damien Charlotin — AI Hallucination Cases Database, AI Tool column note (attribute text) documented · field
    Note: The mention of a specific tool does not necessarily mean that tool was responsible for the hallucinations in question.
  • F20 Damien Charlotin — AI Hallucination Cases Database, graph notes (attribute text) documented · field
    The date of the offending document is parsed automatically from court records and may occasionally be wrong. … These responses are extracted automatically from the decisions and simplified into set categories, so treat them as indicative rather than exact.
8count and compositionDamien Charlotin — AI Hallucination Cases Database7 claims · B1, B3, MMRS
  • F6 Damien Charlotin — AI Hallucination Cases Database, opening ¶2 documented · field
    While seeking to be exhaustive (2231 cases identified so far), it is a work in progress and will expand as new examples emerge.
  • F13 Damien Charlotin — AI Hallucination Cases Database, filters: Party documented · field
    Expert (17) … Judge (32) … Lawyer (880) … Prosecutor (5) … Pro Se Litigant (1288)
  • F14 Damien Charlotin — AI Hallucination Cases Database, filters: State documented · field
    Australia (112) … Canada (238) … UK (82) … USA (1514)
  • F28 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, lede ('In short') documented · field
    In short: Damien Charlotin's AI Hallucination Cases database lists 2,202 court and tribunal decisions involving AI-fabricated citations or content, as of its 19 October 2026 update.
  • F31 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, Key facts documented · field
    By country: United States 1,501; Canada 234; Australia 112; United Kingdom 76; … By filer: pro se litigants 1,267; lawyers 872; judges 32; experts 17 (Charlotin database party filter, 19 October 2026).
  • MMRS-06 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, What it shows s1 documented
    Of its cases, 1,288 involve pro se litigants and 880 lawyers.
  • MMRS-18 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: count (basis operator) documented
    2,231 cases … 2026-10-28 (the site's own update date)
9growthArtificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ3 claims · B3, B7, MMRS
  • F32 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, Key facts documented · field
    Growth: about 200 cases in mid-2025, 719 in January 2026 (Scientific American, 2026), 1,227 in early April 2026 (PlatinumIDS, April 2026), 1,458 on 22 May, 1,598 on 9 June, 2,046 on 21 September and 2,202 on 19 October 2026 (HAQQ checks of the live database).
  • F41 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, What do you mean by “surge” ? documented · field
    I mean that pre-2025, we maybe had two or three cases a month; now that’s below the daily average. … daily average is now five per day.
  • MMRS-19 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: cadence (basis operator) documented
    continuous
10causes and coverage: the maker's readingArtificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ3 claims · B7
  • F42 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, Why the acceleration then ? documented · field
    A combination of factors, including the lag in judicial times … This matches the profile of most cases: either self-represented litigants, or lawyers who are surprised that an existing tool suddenly has an AI component that hallucinates.
  • F48 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, Why so many entries come from the USA ? documented · field
    ‘Murica is blessed - and I mean it - with an excellent legal data ecosystem. … In many countries, especially European countries, legal data - though supposedly public - is hoarded by legal editors
  • F49 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, Any other trends in the data ? documented · field
    one rather evident divisio stands between pure mistakes … the vast majority of cases, and the (substantial) minority of records that involve, for lack of a better word, “bad” actors.
11intake and pipelineArtificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ5 claims · B1, B7, MMRS
  • F9 Damien Charlotin — AI Hallucination Cases Database, opening ¶3 documented · field
    And if you know of a case that should be included, feel free to … contact me.
  • F43 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, How do you find the cases ? documented · field
    A mix of referrals from benevolent randos on the internet … use of dedicated scrapers and bots to automatically monitor some data sources … and good old database searches with, wait for it, keywords.
  • F50 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, When do you intend to stop ? documented · field
    I currently have a rather efficient pipeline to process new entries - which in fact involve the use of AI, though I am careful to check it does not hallucinate.
  • MMRS-08 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, What it shows s3 documented
    The database grows by its editor's reading and by cases readers send.
  • MMRS-17 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: unit, intake (basis operator) documented
    legal decision … editor-curated; readers send cases
12openness: licence and dataDamien Charlotin — AI Hallucination Cases Database3 claims · B1, MMRS
  • F11 Damien Charlotin — AI Hallucination Cases Database, download and update line documented · field
    Click to Download CSV … Last updated: 28 October 2026
  • F12 Damien Charlotin — AI Hallucination Cases Database, Licence box documented · field
    CC BY 4.0 — free to reuse, including commercially, with attribution. … Cite as: AI Hallucination Cases Database, Damien Charlotin,
  • MMRS-15 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: license (basis operator), data_access (basis observed) documented
    CC BY 4.0 … CSV download
13purpose and usesArtificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ3 claims · B1, B7
  • F10 Damien Charlotin — AI Hallucination Cases Database, PelAIkan box documented · field
    Based on this database, I have developed an automated reference checker that also detects hallucinations: PelAIkan.
  • F51 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, What’s the point of the database ultimately ? documented · field
    Intrisic value: practitioners use it to find out what cases are relevant in their own jurisdiction. … And then all these hallucinated cases can serve as benchmarks to fix the issue.
  • F52 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, Because you expect this to be fixed ? documented · field
    likely not at the model stage, no … I don’t think we can ever reduce it to zero given the existing paradigm.
14citation fidelityArtificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ4 claims · B7, MMRS
  • F53 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, Anything else ? documented · field
    For years, we (me included) have cited without reading; but now the costs of that practice have become explicit. In other words, hallucinations expose the epistemic hygiene the legal profession has long lacked, and that is precisely why they deserve to be studied.
  • MMRS-11 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, Place in the field s1 interpretation
    It is the census's most exact record of citation fidelity.
  • MMRS-12 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, Place in the field s2 interpretation
    Each entry is a machine composition that reached a court with sources it invented or misrepresented, and the court's decision is the reception that recorded it.
  • MMRS-22 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: properties.records_attribution (basis operator) interpretation
    yes: nature of hallucination (fabricated, false quotes, misrepresented, outdated advice)
15reception: press, courts, encyclopedia, videoDamien Charlotin — AI Hallucination Cases Database9 claims · B1, B10, B4, B5, B6, B8, B9
  • F7 Damien Charlotin — AI Hallucination Cases Database, opening ¶2 documented · field
    This database has been featured in news media, and indeed in several decisions dealing with hallucinated material.
  • F8 Damien Charlotin — AI Hallucination Cases Database, opening ¶2, footnote 2 documented · field
    Examples of media coverage include: … M. Hiltzik, AI 'hallucinations' are a growing problem for the legal profession (LA Times, 22 May 2025)
  • F36 LinkedIn — George Hannah's Post, card snippet (LinkedIn; post not found) documented · field
    George Hannah 4mo There is now a database tracking every AI hallucination to surface in court. It has logged 1,600 cases so far.
  • F37 YouTube·KARE 11 — How common are AI hallucinations in court cases?, oEmbed title (YouTube, KARE 11, 1:15) documented · field
    How common are AI hallucinations in court cases?
  • F38 YouTube·Miller Law Group — AI Hallucinations Got an Attorney Disbarred, oEmbed title (YouTube, Miller Law Group, 0:53) documented · field
    AI Hallucinations Got an Attorney Disbarred
  • F55 Wikipedia — Artificial intelligence, Applications / Other industry-specific tasks documented · field
    By 2026, judges had issued sanctions and bar associations had issued warnings due to attorney submissions to the courts containing fabricated case law citations hallucinated by AI tools.
  • F57 Wikipedia — Hallucination (artificial intelligence), In legal filings / Canada documented · field
    As of 14 June 2026, Canadian courts and tribunals have received at least 167 filings containing AI-hallucinated, fictitious citations, across 51 courts and tribunals.
  • F58 Wikipedia — Hallucination (artificial intelligence), In legal filings / Israel documented · field
    As of August 2026, Israeli courts and tribunals had identified at least 55 cases in which parties submitted documents containing fictitious citations or otherwise AI-hallucinated arguments.
  • F59 Wikipedia — Mata v. Avianca, Inc., Impact ¶3 documented · field
    Due to the continued usage of GAI in the practice of law, Mata has been described as a landmark case by legal professionals,
16neighbour: HAQQ's sanctions trackerHAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ4 claims · B3, MMRS
  • F33 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, How have AI sanctions escalated? documented · field
    The 2025 and 2026 decisions add revoked admissions, regulator referrals, a contempt finding, a canceled trial, district suspensions and personal costs against the lawyer who signed without checking. … Largest single-matter penalty we can source: about $109,700 in sanctions and fees in Couvrette v. Wisnovsky, D. Oregon (ABA Journal, 2026).
  • F34 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, How is this tracker kept current? documented · field
    Once a month we re-read the live database and primary reporting and check four things: the total count, the largest sourced penalty, new landmark decisions (appellate, cross-border or a new kind of sanction) and the implied daily rate. A number we cannot re-verify comes off the page.
  • F35 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, Why do lawyers keep filing fake AI citations? documented · field
    (HAQQ ran that benchmark and sells a legal AI product, so weigh our numbers accordingly)
  • MMRS-25 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: candidates (surfaced by ai-hallucination-cases-database-aio-20261029) interpretation
    HAQQ — AI Hallucination Cases: The 2,202-Case Sanctions Tracker … a vendor tracker built on Charlotin's count
17neighbour: Natural and Artificial Law's trackersNatural and Artificial Law — AI Hallucination Cases Tracker5 claims · B2, MMRS
  • F24 Natural and Artificial Law — AI Hallucination Cases Tracker, UK box documented · field
    The detailed UK AI Hallucination Cases Tracker … For UK AI hallucination cases, the dedicated UK tracker brings together case records, recorded outcomes, judicial quotations and sources, alongside figures and charts drawn from my fuller research.
  • F25 Natural and Artificial Law — AI Hallucination Cases Tracker, UK box documented · field
    It includes confirmed, suspected and disputed issues: inclusion is not proof of an AI hallucination or wrongdoing.
  • F26 Natural and Artificial Law — AI Hallucination Cases Tracker, international page head documented · field
    International AI hallucination cases tracker … Selected judicial quotations on AI hallucination cases and fabricated/false citations from judgments and decisions across jurisdictions. … By Matthew Lee · Barrister, Doughty Street Chambers … First published: 16 May 2025
  • F27 Natural and Artificial Law — AI Hallucination Cases Tracker, The reason for this collection documented · field
    The collection is selective and does not measure how often these issues occur or establish a worldwide consensus.
  • MMRS-24 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: candidates (surfaced by ai-hallucination-cases-database-aio-20261029) interpretation
    AI Hallucination Cases Tracker (UK), Natural and Artificial Law … a UK companion to Charlotin's database
18the record kept apart from the entityMMRS3 claims · MMRS
  • MMRS-14 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: kind, roles, lifecycle, observed documented
    database … monitoring … reception … active … 2026-10-28
  • MMRS-23 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: relations[0] (capture) documented
    the composition layer's account of the entity, seated in the Capture Registry
  • MMRS-26 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: schema_note (v2, 2026-10-28) stipulation
    each page has two nodes, the MMRS record and the entity it describes; relations are typed; each assertion carries a source and a basis (operator statement, third-party report, our observation, our reading); lifecycle is kept apart from the observation that saw it
19reception: the composition layerCAP6 claims · capture-registry
  • CAP-1-01 capture-registry Capture Registry (EA-WG-CAPTURES-01), entry ai-hallucination-cases-database-aio-20261029 (OBS-4f95ab35a3ac, AXN:0AA6.CAP Lee Sharks (the registry) · 2026-10-29 · ai-hallucination-cases-database-aio-20261029, findings[0] documented
    THE MAKER AND THE SIZE. Damien Charlotin and 'over 2,200' (the record: 2,231 on 28 October) are right. Checked 2026-10-29 against the MMRS meta-aggregator record of 2026-10-28 and the entity's own pages, re-read the same day.
  • CAP-1-02 capture-registry Capture Registry (EA-WG-CAPTURES-01), entry ai-hallucination-cases-database-aio-20261029 (OBS-4f95ab35a3ac, AXN:0AA6.CAP Lee Sharks (the registry) · 2026-10-29 · ai-hallucination-cases-database-aio-20261029, findings[1] interpretation
    THE SCOPE NARROWED TO EXPLICIT. 'Where generative AI explicitly produced hallucinated content' sharpens the database's rule, which admits decisions where the court 'explicitly finds, or implies' reliance on hallucinated material. The implied cases are dropped.
  • CAP-1-03 capture-registry Capture Registry (EA-WG-CAPTURES-01), entry ai-hallucination-cases-database-aio-20261029 (OBS-4f95ab35a3ac, AXN:0AA6.CAP Lee Sharks (the registry) · 2026-10-29 · ai-hallucination-cases-database-aio-20261029, findings[2] documented
    TWO NEIGHBOURS. The UK tracker at Natural and Artificial Law is a separate aggregator; HAQQ's '2,202-case' tracker is built on Charlotin's count. Both added as candidates; the census held neither.
  • CAP-1-04 capture-registry Capture Registry (EA-WG-CAPTURES-01), entry ai-hallucination-cases-database-aio-20261029 (OBS-4f95ab35a3ac, AXN:0AA6.CAP Lee Sharks (the registry) · 2026-10-29 · ai-hallucination-cases-database-aio-20261029, findings[3] documented
    THE PARTIES' ORDER. The record gives 1,288 pro se and 880 lawyers; the composition lists private lawyers first.
  • CAP-1-05 capture-registry Capture Registry (EA-WG-CAPTURES-01), entry ai-hallucination-cases-database-aio-20261029 (OBS-4f95ab35a3ac, AXN:0AA6.CAP Lee Sharks (the registry) · 2026-10-29 · ai-hallucination-cases-database-aio-20261029, analysis s1 interpretation
    The database is composed with its maker, at its size, as the field's primary record, and its admission rule is narrowed from 'finds or implies' to 'explicitly'.
  • CAP-1-06 capture-registry Capture Registry (EA-WG-CAPTURES-01), entry ai-hallucination-cases-database-aio-20261029 (OBS-4f95ab35a3ac, AXN:0AA6.CAP Lee Sharks (the registry) · 2026-10-29 · ai-hallucination-cases-database-aio-20261029, analysis s2 interpretation
    The cards show the database already aggregated in turn: a regional companion and a vendor tracker counting its cases.
AIO's transcript, a record · ai hallucination cases database · Google AI Overview (expanded) · 174 words · 6 cards
[Google AI Overview at the query, signed out and incognito (operator defaults of 2026-10-01 and 2026-10-14), 2026-10-29. The paste is the Overview expanded (the 'AI Mode Conversation' view, with the source cards that follow the answer); the 'You said' line carries the query twice, run together, and is given once here. Inline links are Google redirect URLs, kept as pasted. The closing disclaimer cut.]

[QUERENT] ai hallucination cases database

[SYSTEM] The primary public database tracking generative AI hallucinations in court decisions is the AI Hallucination Cases Database, created and maintained by Damien Charlotin. [[1](https://www.google.com/goto?url=CAESZwHrOzAVTnkleGAHX1mAOrGX59Wc7v8Uc5cmAlMnuWodCKaUovVn8Oi0KjDlmPrp8GZDFrkKGBDerWHObaUlN-CHykyZJfcs4HfDu8dmxkH-kY4kWbwQilsAalbt0xya1c9pHDZ6Qs8), [2](https://www.google.com/goto?url=CAESuwEB6zswFZI2k1Macj54-ApzOItY9oE6ADRc51VbyeZciKjuZo0IdZH0K-qU9ECzYE4N43Fw5fp_G_qLB4R_BBXH7FT6O4KOzn9HbJtjnzGrNzCpQX46G7ED_Jh1zStUooF9wZWRWdhB7QuMJspwqiEw9yAInziQu60uVaMNBO7oZKCV_q4K-lMJkAcOzXDixfgTvx5GqI9IE2-CIp2JbBMx3bqEEYVjqJjnQpO5YsXm0O9JEQhvaYIKm8q8)]
Key Details About the Database

* Focus: It tracks court and tribunal decisions where generative AI explicitly produced hallucinated content, most commonly fake legal citations, fabricated quotes, and non-existent case law. [[1](https://www.google.com/goto?url=CAESYgHrOzAV34sngE-okY3nFowy90w-C91PhQU52qunX7d1V7bA3J2rFsYhVfCAciIE6tAbJyuXhmOeskHb3D9mOmbPiXpbOFPqIbOl4eSH3JBETTlQq0HlgZu2TWQ6mpZtt7I3), [2](https://www.google.com/goto?url=CAESZwHrOzAVTnkleGAHX1mAOrGX59Wc7v8Uc5cmAlMnuWodCKaUovVn8Oi0KjDlmPrp8GZDFrkKGBDerWHObaUlN-CHykyZJfcs4HfDu8dmxkH-kY4kWbwQilsAalbt0xya1c9pHDZ6Qs8)]
* Scope & Size: As of October 2026, the database contains over 2,200 documented decisions globally, with U.S. federal and state courts making up the majority of the cases. [[1](https://www.google.com/goto?url=CAESbQHrOzAVhu-UpusMS_JdfzJ1WAJqeSV-lNBGKsdqycyIesI_S08KM2qas0aRzDgWTcIBO-QSYXqwi1HKsupxT6nPMymUUgRypqn9kakdhYM2hgCS-TzM0AeEJZW8bNZ6L7JT3sNeBjOvIc9D-jE)]
* Parties Involved: The tracked decisions span private lawyers, pro se (self-represented) litigants, expert witnesses, prosecutors, and judges. [[1](https://www.google.com/goto?url=CAESYgHrOzAV34sngE-okY3nFowy90w-C91PhQU52qunX7d1V7bA3J2rFsYhVfCAciIE6tAbJyuXhmOeskHb3D9mOmbPiXpbOFPqIbOl4eSH3JBETTlQq0HlgZu2TWQ6mpZtt7I3), [2](https://www.google.com/goto?url=CAESbQHrOzAVhu-UpusMS_JdfzJ1WAJqeSV-lNBGKsdqycyIesI_S08KM2qas0aRzDgWTcIBO-QSYXqwi1HKsupxT6nPMymUUgRypqn9kakdhYM2hgCS-TzM0AeEJZW8bNZ6L7JT3sNeBjOvIc9D-jE)]
* Sanctions: The database helps track legal consequences ranging from strict warnings and mandatory verification rules to substantial monetary sanctions and disbarment. [[1](https://www.google.com/goto?url=CAESYgHrOzAVGXssF8z2PHmZKXR2t1YMRKKlIrlzJy732r-JrMp71MuGzF4ttCp0p_oDxeafh3ABKcyKayOEz7kVxilc4AGTmnUupKuxgEwBTFO0P_q1xQ_1LFSuh4Pv0JduZwNA), [2](https://www.google.com/goto?url=CAESbQHrOzAVhu-UpusMS_JdfzJ1WAJqeSV-lNBGKsdqycyIesI_S08KM2qas0aRzDgWTcIBO-QSYXqwi1HKsupxT6nPMymUUgRypqn9kakdhYM2hgCS-TzM0AeEJZW8bNZ6L7JT3sNeBjOvIc9D-jE)]

Where to Access It

* You can view and search the project directly at the [AI Hallucination Cases Database](https://www.google.com/goto?url=CAESZwHrOzAVTnkleGAHX1mAOrGX59Wc7v8Uc5cmAlMnuWodCKaUovVn8Oi0KjDlmPrp8GZDFrkKGBDerWHObaUlN-CHykyZJfcs4HfDu8dmxkH-kY4kWbwQilsAalbt0xya1c9pHDZ6Qs8). [[1](https://www.google.com/goto?url=CAESZwHrOzAVTnkleGAHX1mAOrGX59Wc7v8Uc5cmAlMnuWodCKaUovVn8Oi0KjDlmPrp8GZDFrkKGBDerWHObaUlN-CHykyZJfcs4HfDu8dmxkH-kY4kWbwQilsAalbt0xya1c9pHDZ6Qs8)]
* For specialized UK records, a companion resource is available via the [AI Hallucination Cases Tracker](https://www.google.com/goto?url=CAESewHrOzAVg4EDkst6ryxEglIv4g35btpV6DO9U3A34FDol_JztAZuiwM86LPuDHswEf58I3i2z4TfjCLidmolyQei8wwx0HK_kZbCoWrww31Vm1lgJUWvklaEzwrufIEY15WoYgdALFUUXCIeqDrw6AMpK58DXy8_ObOxkQ). [[1](https://www.google.com/goto?url=CAESewHrOzAVg4EDkst6ryxEglIv4g35btpV6DO9U3A34FDol_JztAZuiwM86LPuDHswEf58I3i2z4TfjCLidmolyQei8wwx0HK_kZbCoWrww31Vm1lgJUWvklaEzwrufIEY15WoYgdALFUUXCIeqDrw6AMpK58DXy8_ObOxkQ)]

Would you like information on specific high-profile sanctions cases from the database, or guidance on how legal professionals verify AI output?
Damien Charlotin
AI Hallucination Cases Database
AI Hallucination Cases This database tracks legal decisions 1 Notably, this does not cover mere allegations of hallucinations, but only cases where the court or...
Natural and Artificial Law
AI Hallucination Cases Tracker
The detailed UK AI Hallucination Cases Tracker For UK AI hallucination cases, the dedicated UK tracker brings together case records, recorded outcomes, judicial...
HAQQ
AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ
AI Hallucination Cases: The 2202-Case Sanctions Tracker * Blog * AI Hallucination Cases: The 2,202-Case Sanctions Tracker AI Hallucination Cases: The 2,202-Case...
LinkedIn
George Hannah's Post
George Hannah's Post George Hannah 4mo There is now a database tracking every AI hallucination to surface in court. It has logged 1,600 cases so far. It's calle...
YouTube·KARE 11
1:15
How common are AI hallucinations in court cases?
YouTube·Miller Law Group
0:53
AI Hallucinations Got an Attorney Disbarred

register entry ai-hallucination-cases-database-aio-20261029

Expansion · Field and archive, equal terms — L(B ∪ A)27 sentences · every one sourced below

AI Hallucination Cases

AI Hallucination Cases is Damien Charlotin's database of legal decisions in which a court or tribunal finds or implies reliance on hallucinated material (MMRS record); its own page says it "tracks legal decisions" in cases where generative AI produced hallucinated content, "typically fake citations, but also other types of AI-generated arguments", and describes itself as "the most comprehensive database of AI hallucination cases in law". Charlotin wrote in November 2025 that he maintains it on his personal website (FAQ), and the MMRS record gives him as its operator by his own statement; HAQQ's tracker calls him a research fellow at HEC Paris, and Wikipedia's articles on artificial intelligence and on hallucination a legal data analysis lecturer at HEC Paris and Sciences Po.

Its unit is the decision (MMRS record), which its page defines as any document "where the use of AI, whether established or merely alleged, is addressed in more than a passing reference by the court or tribunal"; it admits "only cases where the court or tribunal has explicitly found (or implied) that a party relied on hallucinated content or material", which the MMRS record states as reliance a court "explicitly finds, or implies", entering it in its self-description field and as the property that admission requires "a court finding or implication of reliance on hallucinated material". The judgment is the courts': "I am not making that judgment, I let the courts and judges make or imply it, which is why the database is necessarily an undercount" (FAQ); HAQQ restates the bar as a court that "found, or clearly implied" reliance, accusations alone not counting, and the FAQ holds that most hallucinations are "very obvious", a made-up case name or false quote one that "cannot be a human mistake". Its exceptions are stated twice, and the statements pull apart: its page "also covers some judicial decisions where AI use was alleged but not confirmed", "a judgment call on my part", while the FAQ says he refrains "from adding rows about cases where hallucinations are only alleged" and, in a February 2026 edit, makes an exception where the alleged hallucination comes from a judge and, absent an appeal decision or retraction, he is "bound to make a judgment call"; the MMRS record composes both as "Mere allegations are excluded, with some judgment calls admitted."

It states its boundary itself, that it "does not track the (necessarily wider) universe of all fake citations or use of AI in court filings" (its page; quoted by the MMRS record), and on the MMRS record's reading a fabricated citation enters only when a court catches and rules on it; HAQQ draws the same consequence for its reading of the count, "a fake citation nobody checks never reaches the database, so 2,202 is a floor".

Each record gives the case, the court and jurisdiction, the date, the party using AI, the AI tool, the nature of the hallucination, the outcome or sanction, the monetary penalty, details and reports (its table; the MMRS record lists the court, date, party, tool where named, nature and outcome), the nature filed as Fabricated (1,829), False Quotes (595), Misrepresented (947) or Outdated Advice (38). Its outcomes can be filtered for monetary sanctions and disciplinary referrals, and a penalty recorded as 1 "is a placeholder, not the real figure", the amount being unknown (its page). Its page states the record's limits: AI tools are tracked "only as disclosed or admitted by parties in court filings", with 'Unidentified' and 'Implied' as the defaults; a named tool "does not necessarily mean that tool was responsible"; offending-document dates are parsed automatically and "may occasionally be wrong", and responses when caught are extracted automatically, "indicative rather than exact".

Seeking to be exhaustive, it had identified 2,231 cases at its update of 28 October 2026 and calls itself "a work in progress" (its page; the MMRS record gives the same count as of the site's own update date), 1,514 of them from the USA, 238 from Canada, 112 from Australia and 82 from the UK, with 1,288 involving pro se litigants, 880 lawyers, 32 judges, 17 experts and 5 prosecutors (its filters; the MMRS record gives the pro se and lawyer counts). HAQQ, reading the database's update of 19 October 2026, gives 2,202 decisions, 1,501 from the United States, 1,267 involving pro se litigants and 872 lawyers.

Charlotin started it in April 2025 while teaching Sciences Po Law School students on the "Limits and Potentials" of LLMs in law, when he looked for data on hallucinations and, finding none, decided to "tally the cases myself" (FAQ); Wikipedia dates its establishment to April 2025 and places its creation among the effects of law firms' use of generative AI for research; its period filter begins in the second quarter of 2023 (its page; MMRS record), and the MMRS record's census enters that filter as its founding. Before 2025, the FAQ says, "we maybe had two or three cases a month", and by February 2026 the daily average was five; Wikipedia's hallucination article gives over 1,300 instances a year after its start, a LinkedIn post four months before the capture 1,600 cases, and HAQQ's series about 200 in mid-2025, 719 in January 2026 and 2,202 on 19 October 2026; its page reads "Updated daily" and was last updated on 28 October 2026, and the MMRS record gives its cadence as continuous. The FAQ attributes the acceleration to judicial lag, the availability of LLMs and public knowledge of them, matching a profile of self-represented litigants or lawyers surprised by a tool's new AI component, and explains the share of US entries by the US legal data ecosystem, legal data in many European countries being "hoarded by legal editors". It divides the records into pure mistakes, "the vast majority of cases", and a "(substantial) minority" involving "bad" actors (FAQ).

Cases come from referrals, scrapers and bots monitoring data sources, and keyword searches (FAQ), and readers are asked to send cases (its page); the MMRS record gives the intake as editor-curated with readers sending cases and the database growing by its editor's reading and readers' cases; the pipeline for new entries itself uses AI, "though I am careful to check it does not hallucinate" (FAQ). It is licensed CC BY 4.0, "free to reuse, including commercially, with attribution", to be cited as "AI Hallucination Cases Database, Damien Charlotin", and its cases download as CSV (its page; MMRS record).

The FAQ gives its use as practitioners finding the cases relevant in their own jurisdiction, data analyses, and the cases as "benchmarks to fix the issue"; from it Charlotin built PelAIkan, "an automated reference checker that also detects hallucinations" (its page), and he expects no fix "at the model stage" and no reduction to zero "given the existing paradigm" (FAQ, a forecast).

"For years, we (me included) have cited without reading; but now the costs of that practice have become explicit": hallucinations, the FAQ says, "expose the epistemic hygiene the legal profession has long lacked". The MMRS record reads it as "the census's most exact record of citation fidelity", recording attribution by the nature of the hallucination: "Each entry is a machine composition that reached a court with sources it invented or misrepresented, and the court's decision is the reception that recorded it."

It has been featured in news media "and indeed in several decisions dealing with hallucinated material", the LA Times among them in May 2025 (its page); Wikipedia cites it for counts of Canadian filings (at least 167 by 14 June 2026, with courtready.ca) and Israeli cases (at least 55 by August 2026) and, in its article on Mata v. Avianca, for that case's description as a landmark, and its article on artificial intelligence records judges' sanctions and bar warnings by 2026. On the Overview's video cards it appears at title grain: KARE 11's "How common are AI hallucinations in court cases?" and Miller Law Group's "AI Hallucinations Got an Attorney Disbarred".

HAQQ, which discloses that it "sells a legal AI product", re-reads the live database monthly and takes off its page any number it cannot re-verify, and lists sanctions from revoked admissions to personal costs, the largest it can source about $109,700 (HAQQ); the MMRS record enters it as a candidate, "a vendor tracker built on Charlotin's count". Matthew Lee, a barrister at Doughty Street Chambers, keeps at Natural and Artificial Law an international tracker of "Selected judicial quotations" on AI hallucination cases and fabricated or false citations, first published 16 May 2025, which "does not measure how often these issues occur", and a separate UK tracker of case records, outcomes, quotations and sources in which "inclusion is not proof of an AI hallucination or wrongdoing"; neither page names Charlotin's database, which the MMRS record's candidate list enters as "a UK companion to Charlotin's database". The Capture Registry (2026-10-29) holds the UK tracker a separate aggregator and HAQQ's tracker, which gives the database's 2,202 decisions of 19 October (HAQQ), built on Charlotin's count, both added as candidates the census did not hold, and reads the cards as the database "already aggregated in turn: a regional companion and a vendor tracker counting its cases".

The MMRS record keeps itself apart from the entity, each assertion with a source and a basis and the lifecycle apart from the observation that saw it, records the database as active on 28 October 2026 with the roles of monitoring and reception, and relates it to the composition layer's account seated in the Capture Registry. There (Capture Registry, 2026-10-29) the Overview at 'ai hallucination cases database' composes the database with its maker and at its size, Charlotin and 'over 2,200' being right against the 2,231 its page gives, as the field's primary record; it narrows the admission rule, which the page states as reliance the court "has explicitly found (or implied)", to 'explicitly', so that the implied cases are dropped, and lists private lawyers first where the page's filters give 1,288 pro se litigants and 880 lawyers.

Provenance — every sentence sourced27 sentences

27 sentences; 59 field claims, 32 archive claims. Modality is the source's own; the prose carries it in its grammar.

1.AI Hallucination Cases is Damien Charlotin's database of legal decisions in which a court or tribunal finds or implies reliance on hallucinated material (MMRS record); its own page says it "tracks legal decisions" in cases where generative AI produced hallucinated content, "typically fake citations, but also other types of AI-generated arguments", and describes itself as "the most comprehensive database of AI hallucination cases in law".3
  • MMRS-01 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · articles.py ARTICLES['ai-hallucination-cases'], kernel stipulation
    AI Hallucination Cases is Damien Charlotin's database of legal decisions in which a court or tribunal finds or implies reliance on hallucinated material: 2,231 decisions worldwide as of 28 October 2026, CC BY 4.0, with a CSV export.
  • F1 Damien Charlotin — AI Hallucination Cases Database, opening ¶1 documented · field
    This database tracks legal decisions … in cases where generative AI produced hallucinated content – typically fake citations, but also other types of AI-generated arguments.
  • F22 Damien Charlotin — AI Hallucination Cases Database, meta description (attribute text) documented · field
    The most comprehensive database of AI hallucination cases in law: legal decisions from courts worldwide, searchable by country, party, AI tool, and outcome. Updated daily.
2.Charlotin wrote in November 2025 that he maintains it on his personal website (FAQ), and the MMRS record gives him as its operator by his own statement; HAQQ's tracker calls him a research fellow at HEC Paris, and Wikipedia's articles on artificial intelligence and on hallucination a legal data analysis lecturer at HEC Paris and Sciences Po.5
  • F39 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, ¶1 documented · field
    As some of you know, I am maintaining an AI Hallucinations Cases database on my personal website.
  • MMRS-13 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: operator, url (evidence: damiencharlotin.com/hallucinations, basis operator) documented
    Damien Charlotin … https://www.damiencharlotin.com/hallucinations/
  • F29 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, How many AI hallucination cases are there? documented · field
    The database is maintained by Damien Charlotin, a research fellow at HEC Paris. Its inclusion bar is strict: a decision is listed only where a court or tribunal found, or clearly implied, that a party relied on hallucinated material. Accusations alone do not count.
  • F54 Wikipedia — Artificial intelligence, Applications / Other industry-specific tasks documented · field
    The use of generative AI by law firms for legal research resulted in the creation of the global "AI Hallucination Cases" database, in April 2025, established by HEC Paris and Sciences Po legal data analysis lecturer Damien Charlotin.
  • F56 Wikipedia — Hallucination (artificial intelligence), In legal filings / United States ¶1 documented · field
    A database of incidents, "AI Hallucination Cases", was established in April 2025 by HEC Paris and Sciences Po legal data analysis lecturer Damien Charlotin; one year later, it listed over 1300 instances of hallucinations in legal decisions.
3.Its unit is the decision (MMRS record), which its page defines as any document "where the use of AI, whether established or merely alleged, is addressed in more than a passing reference by the court or tribunal"; it admits "only cases where the court or tribunal has explicitly found (or implied) that a party relied on hallucinated content or material", which the MMRS record states as reliance a court "explicitly finds, or implies", entering it in its self-description field and as the property that admission requires "a court finding or implication of reliance on hallucinated material".6
  • MMRS-02 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, What it is s1 stipulation
    Its unit is the decision.
  • F2 Damien Charlotin — AI Hallucination Cases Database, opening ¶1, footnote 1 ¶1 documented · field
    I.e., all documents where the use of AI, whether established or merely alleged, is addressed in more than a passing reference by the court or tribunal.
  • F3 Damien Charlotin — AI Hallucination Cases Database, opening ¶1, footnote 1 ¶2 documented · field
    Notably, this does not cover mere allegations of hallucinations, but only cases where the court or tribunal has explicitly found (or implied) that a party relied on hallucinated content or material.
  • MMRS-03 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, What it is s2 attributed
    A case enters when a court or tribunal addresses AI use in more than a passing reference and explicitly finds, or implies, reliance on hallucinated material.
  • MMRS-16 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: self_description (basis operator) attributed
    legal decisions in which a court or tribunal addresses AI use in more than a passing reference, where it finds or implies reliance on hallucinated material
  • MMRS-21 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: properties.admission_requires_harm (basis operator) attributed
    a court finding or implication of reliance on hallucinated material
4.The judgment is the courts': "I am not making that judgment, I let the courts and judges make or imply it, which is why the database is necessarily an undercount" (FAQ); HAQQ restates the bar as a court that "found, or clearly implied" reliance, accusations alone not counting, and the FAQ holds that most hallucinations are "very obvious", a made-up case name or false quote one that "cannot be a human mistake".3
  • F44 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, But then, how do you know a case actually involves an hallucination ? documented · field
    That’s the point: I am not making that judgment, I let the courts and judges make or imply it, which is why the database is necessarily an undercount.
  • F29 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, How many AI hallucination cases are there? documented · field
    The database is maintained by Damien Charlotin, a research fellow at HEC Paris. Its inclusion bar is strict: a decision is listed only where a court or tribunal found, or clearly implied, that a party relied on hallucinated material. Accusations alone do not count.
  • F46 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, But then, how do you know a case actually involves an hallucination ? documented · field
    by their nature, most hallucinations are very obvious, making up a case name or a false quote is not, cannot be a human mistake
5.Its exceptions are stated twice, and the statements pull apart: its page "also covers some judicial decisions where AI use was alleged but not confirmed", "a judgment call on my part", while the FAQ says he refrains "from adding rows about cases where hallucinations are only alleged" and, in a February 2026 edit, makes an exception where the alleged hallucination comes from a judge and, absent an appeal decision or retraction, he is "bound to make a judgment call"; the MMRS record composes both as "Mere allegations are excluded, with some judgment calls admitted."4
  • F4 Damien Charlotin — AI Hallucination Cases Database, opening ¶1, footnote 1 ¶3 documented · field
    As an exception, the database also covers some judicial decisions where AI use was alleged but not confirmed. This is a judgment call on my part.
  • F45 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, But then, how do you know a case actually involves an hallucination ? documented · field
    It’s also why I refrain from adding rows about cases where hallucinations are only alleged
  • F47 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, But then, how do you know … ? (edit, Feb 2026) documented · field
    [Edit, Feb 2026: I should add an exception here, in cases where the alleged hallucination comes from a judge: absent an appeal court decision or an official retractation, I am bound to make a judgment call.]
  • MMRS-04 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, What it is s3 attributed
    Mere allegations are excluded, with some judgment calls admitted.
6.It states its boundary itself, that it "does not track the (necessarily wider) universe of all fake citations or use of AI in court filings" (its page; quoted by the MMRS record), and on the MMRS record's reading a fabricated citation enters only when a court catches and rules on it; HAQQ draws the same consequence for its reading of the count, "a fake citation nobody checks never reaches the database, so 2,202 is a floor".4
  • F5 Damien Charlotin — AI Hallucination Cases Database, opening ¶1 documented · field
    It does not track the (necessarily wider) universe of all fake citations or use of AI in court filings.
  • MMRS-09 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, What its selection leaves out s1 attributed
    It states its own boundary: it does not track "the (necessarily wider) universe of all fake citations or use of AI in court filings."
  • MMRS-10 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, What its selection leaves out s2 interpretation
    A fabricated citation enters when a court catches and rules on it.
  • F30 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, How many AI hallucination cases are there? (caveats) documented · field
    First, it counts only what a judge caught and wrote up; a fake citation nobody checks never reaches the database, so 2,202 is a floor.
7.Each record gives the case, the court and jurisdiction, the date, the party using AI, the AI tool, the nature of the hallucination, the outcome or sanction, the monetary penalty, details and reports (its table; the MMRS record lists the court, date, party, tool where named, nature and outcome), the nature filed as Fabricated (1,829), False Quotes (595), Misrepresented (947) or Outdated Advice (38).3
  • F17 Damien Charlotin — AI Hallucination Cases Database, table header documented · field
    Court / Jurisdiction … Party Using AI … AI Tool … Nature of Hallucination … Outcome / Sanction … Monetary Penalty … Details … Report(s)
  • MMRS-05 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, What it is s4 attributed
    Each record carries the court, date, the party that used AI, the tool where named, the nature of the hallucination (fabricated, false quotes, misrepresented, outdated advice), and the outcome and sanction.
  • F15 Damien Charlotin — AI Hallucination Cases Database, filters: Nature – Category documented · field
    Fabricated (1829) … False Quotes (595) … Misrepresented (947) … Outdated Advice (38)
8.Its outcomes can be filtered for monetary sanctions and disciplinary referrals, and a penalty recorded as 1 "is a placeholder, not the real figure", the amount being unknown (its page).2
  • F23 Damien Charlotin — AI Hallucination Cases Database, filters: outcome documented · field
    Monetary sanction … Disciplinary Referral
  • F21 Damien Charlotin — AI Hallucination Cases Database, Monetary sanction note (attribute text) documented · field
    A monetary penalty recorded as 1 is a placeholder, not the real figure: the court imposed a monetary sanction but the amount is unknown to us.
9.Its page states the record's limits: AI tools are tracked "only as disclosed or admitted by parties in court filings", with 'Unidentified' and 'Implied' as the defaults; a named tool "does not necessarily mean that tool was responsible"; offending-document dates are parsed automatically and "may occasionally be wrong", and responses when caught are extracted automatically, "indicative rather than exact".3
  • F18 Damien Charlotin — AI Hallucination Cases Database, AI Tool column note (attribute text) documented · field
    This database tracks AI tools only as disclosed or admitted by parties in court filings. If AI use was acknowledged but no specific tool was named, the entry reads 'Unidentified.' Otherwise, the default value is 'Implied' when AI use is evident but not explicitly confirmed.
  • F19 Damien Charlotin — AI Hallucination Cases Database, AI Tool column note (attribute text) documented · field
    Note: The mention of a specific tool does not necessarily mean that tool was responsible for the hallucinations in question.
  • F20 Damien Charlotin — AI Hallucination Cases Database, graph notes (attribute text) documented · field
    The date of the offending document is parsed automatically from court records and may occasionally be wrong. … These responses are extracted automatically from the decisions and simplified into set categories, so treat them as indicative rather than exact.
10.Seeking to be exhaustive, it had identified 2,231 cases at its update of 28 October 2026 and calls itself "a work in progress" (its page; the MMRS record gives the same count as of the site's own update date), 1,514 of them from the USA, 238 from Canada, 112 from Australia and 82 from the UK, with 1,288 involving pro se litigants, 880 lawyers, 32 judges, 17 experts and 5 prosecutors (its filters; the MMRS record gives the pro se and lawyer counts).5
  • F6 Damien Charlotin — AI Hallucination Cases Database, opening ¶2 documented · field
    While seeking to be exhaustive (2231 cases identified so far), it is a work in progress and will expand as new examples emerge.
  • MMRS-18 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: count (basis operator) documented
    2,231 cases … 2026-10-28 (the site's own update date)
  • F14 Damien Charlotin — AI Hallucination Cases Database, filters: State documented · field
    Australia (112) … Canada (238) … UK (82) … USA (1514)
  • F13 Damien Charlotin — AI Hallucination Cases Database, filters: Party documented · field
    Expert (17) … Judge (32) … Lawyer (880) … Prosecutor (5) … Pro Se Litigant (1288)
  • MMRS-06 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, What it shows s1 documented
    Of its cases, 1,288 involve pro se litigants and 880 lawyers.
11.HAQQ, reading the database's update of 19 October 2026, gives 2,202 decisions, 1,501 from the United States, 1,267 involving pro se litigants and 872 lawyers.2
  • F28 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, lede ('In short') documented · field
    In short: Damien Charlotin's AI Hallucination Cases database lists 2,202 court and tribunal decisions involving AI-fabricated citations or content, as of its 19 October 2026 update.
  • F31 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, Key facts documented · field
    By country: United States 1,501; Canada 234; Australia 112; United Kingdom 76; … By filer: pro se litigants 1,267; lawyers 872; judges 32; experts 17 (Charlotin database party filter, 19 October 2026).
12.Charlotin started it in April 2025 while teaching Sciences Po Law School students on the "Limits and Potentials" of LLMs in law, when he looked for data on hallucinations and, finding none, decided to "tally the cases myself" (FAQ); Wikipedia dates its establishment to April 2025 and places its creation among the effects of law firms' use of generative AI for research; its period filter begins in the second quarter of 2023 (its page; MMRS record), and the MMRS record's census enters that filter as its founding.6
  • F40 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, When did you start the database, and why ? documented · field
    April 2025. I was teaching this course to sorry Sciences Po Law School students, discussing in particular the “Limits and Potentials” of LLMs in the legal domain, when we started touching on the phenomenon of hallucinations. … I looked out for actual data here. Since there was none, … I figured, “hey, let’s tally the cases myself”.
  • F54 Wikipedia — Artificial intelligence, Applications / Other industry-specific tasks documented · field
    The use of generative AI by law firms for legal research resulted in the creation of the global "AI Hallucination Cases" database, in April 2025, established by HEC Paris and Sciences Po legal data analysis lecturer Damien Charlotin.
  • F56 Wikipedia — Hallucination (artificial intelligence), In legal filings / United States ¶1 documented · field
    A database of incidents, "AI Hallucination Cases", was established in April 2025 by HEC Paris and Sciences Po legal data analysis lecturer Damien Charlotin; one year later, it listed over 1300 instances of hallucinations in legal decisions.
  • F16 Damien Charlotin — AI Hallucination Cases Database, filters: From period documented · field
    From period: Q2 2023
  • MMRS-07 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, What it shows s2 documented
    The period filter begins in the second quarter of 2023.
  • MMRS-20 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: founded (basis observed) documented
    the period filter begins Q2 2023
13.Before 2025, the FAQ says, "we maybe had two or three cases a month", and by February 2026 the daily average was five; Wikipedia's hallucination article gives over 1,300 instances a year after its start, a LinkedIn post four months before the capture 1,600 cases, and HAQQ's series about 200 in mid-2025, 719 in January 2026 and 2,202 on 19 October 2026; its page reads "Updated daily" and was last updated on 28 October 2026, and the MMRS record gives its cadence as continuous.7
  • F41 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, What do you mean by “surge” ? documented · field
    I mean that pre-2025, we maybe had two or three cases a month; now that’s below the daily average. … daily average is now five per day.
  • F56 Wikipedia — Hallucination (artificial intelligence), In legal filings / United States ¶1 documented · field
    A database of incidents, "AI Hallucination Cases", was established in April 2025 by HEC Paris and Sciences Po legal data analysis lecturer Damien Charlotin; one year later, it listed over 1300 instances of hallucinations in legal decisions.
  • F36 LinkedIn — George Hannah's Post, card snippet (LinkedIn; post not found) documented · field
    George Hannah 4mo There is now a database tracking every AI hallucination to surface in court. It has logged 1,600 cases so far.
  • F32 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, Key facts documented · field
    Growth: about 200 cases in mid-2025, 719 in January 2026 (Scientific American, 2026), 1,227 in early April 2026 (PlatinumIDS, April 2026), 1,458 on 22 May, 1,598 on 9 June, 2,046 on 21 September and 2,202 on 19 October 2026 (HAQQ checks of the live database).
  • F22 Damien Charlotin — AI Hallucination Cases Database, meta description (attribute text) documented · field
    The most comprehensive database of AI hallucination cases in law: legal decisions from courts worldwide, searchable by country, party, AI tool, and outcome. Updated daily.
  • F11 Damien Charlotin — AI Hallucination Cases Database, download and update line documented · field
    Click to Download CSV … Last updated: 28 October 2026
  • MMRS-19 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: cadence (basis operator) documented
    continuous
14.The FAQ attributes the acceleration to judicial lag, the availability of LLMs and public knowledge of them, matching a profile of self-represented litigants or lawyers surprised by a tool's new AI component, and explains the share of US entries by the US legal data ecosystem, legal data in many European countries being "hoarded by legal editors".2
  • F42 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, Why the acceleration then ? documented · field
    A combination of factors, including the lag in judicial times … This matches the profile of most cases: either self-represented litigants, or lawyers who are surprised that an existing tool suddenly has an AI component that hallucinates.
  • F48 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, Why so many entries come from the USA ? documented · field
    ‘Murica is blessed - and I mean it - with an excellent legal data ecosystem. … In many countries, especially European countries, legal data - though supposedly public - is hoarded by legal editors
15.It divides the records into pure mistakes, "the vast majority of cases", and a "(substantial) minority" involving "bad" actors (FAQ).1
  • F49 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, Any other trends in the data ? documented · field
    one rather evident divisio stands between pure mistakes … the vast majority of cases, and the (substantial) minority of records that involve, for lack of a better word, “bad” actors.
16.Cases come from referrals, scrapers and bots monitoring data sources, and keyword searches (FAQ), and readers are asked to send cases (its page); the MMRS record gives the intake as editor-curated with readers sending cases and the database growing by its editor's reading and readers' cases; the pipeline for new entries itself uses AI, "though I am careful to check it does not hallucinate" (FAQ).5
  • F43 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, How do you find the cases ? documented · field
    A mix of referrals from benevolent randos on the internet … use of dedicated scrapers and bots to automatically monitor some data sources … and good old database searches with, wait for it, keywords.
  • F9 Damien Charlotin — AI Hallucination Cases Database, opening ¶3 documented · field
    And if you know of a case that should be included, feel free to … contact me.
  • MMRS-17 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: unit, intake (basis operator) documented
    legal decision … editor-curated; readers send cases
  • MMRS-08 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, What it shows s3 documented
    The database grows by its editor's reading and by cases readers send.
  • F50 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, When do you intend to stop ? documented · field
    I currently have a rather efficient pipeline to process new entries - which in fact involve the use of AI, though I am careful to check it does not hallucinate.
17.It is licensed CC BY 4.0, "free to reuse, including commercially, with attribution", to be cited as "AI Hallucination Cases Database, Damien Charlotin", and its cases download as CSV (its page; MMRS record).3
  • F12 Damien Charlotin — AI Hallucination Cases Database, Licence box documented · field
    CC BY 4.0 — free to reuse, including commercially, with attribution. … Cite as: AI Hallucination Cases Database, Damien Charlotin,
  • F11 Damien Charlotin — AI Hallucination Cases Database, download and update line documented · field
    Click to Download CSV … Last updated: 28 October 2026
  • MMRS-15 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: license (basis operator), data_access (basis observed) documented
    CC BY 4.0 … CSV download
18.The FAQ gives its use as practitioners finding the cases relevant in their own jurisdiction, data analyses, and the cases as "benchmarks to fix the issue"; from it Charlotin built PelAIkan, "an automated reference checker that also detects hallucinations" (its page), and he expects no fix "at the model stage" and no reduction to zero "given the existing paradigm" (FAQ, a forecast).3
  • F51 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, What’s the point of the database ultimately ? documented · field
    Intrisic value: practitioners use it to find out what cases are relevant in their own jurisdiction. … And then all these hallucinated cases can serve as benchmarks to fix the issue.
  • F10 Damien Charlotin — AI Hallucination Cases Database, PelAIkan box documented · field
    Based on this database, I have developed an automated reference checker that also detects hallucinations: PelAIkan.
  • F52 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, Because you expect this to be fixed ? documented · field
    likely not at the model stage, no … I don’t think we can ever reduce it to zero given the existing paradigm.
19."For years, we (me included) have cited without reading; but now the costs of that practice have become explicit": hallucinations, the FAQ says, "expose the epistemic hygiene the legal profession has long lacked".1
  • F53 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, Anything else ? documented · field
    For years, we (me included) have cited without reading; but now the costs of that practice have become explicit. In other words, hallucinations expose the epistemic hygiene the legal profession has long lacked, and that is precisely why they deserve to be studied.
20.The MMRS record reads it as "the census's most exact record of citation fidelity", recording attribution by the nature of the hallucination: "Each entry is a machine composition that reached a court with sources it invented or misrepresented, and the court's decision is the reception that recorded it."3
  • MMRS-11 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, Place in the field s1 interpretation
    It is the census's most exact record of citation fidelity.
  • MMRS-22 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: properties.records_attribution (basis operator) interpretation
    yes: nature of hallucination (fabricated, false quotes, misrepresented, outdated advice)
  • MMRS-12 MMRS MMRS meta-aggregator record: AI Hallucination Cases (article; https://www.machinemediation.org/aggregators/ai-hallucinat Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · article, Place in the field s2 interpretation
    Each entry is a machine composition that reached a court with sources it invented or misrepresented, and the court's decision is the reception that recorded it.
21.It has been featured in news media "and indeed in several decisions dealing with hallucinated material", the LA Times among them in May 2025 (its page); Wikipedia cites it for counts of Canadian filings (at least 167 by 14 June 2026, with courtready.ca) and Israeli cases (at least 55 by August 2026) and, in its article on Mata v. Avianca, for that case's description as a landmark, and its article on artificial intelligence records judges' sanctions and bar warnings by 2026.6
  • F7 Damien Charlotin — AI Hallucination Cases Database, opening ¶2 documented · field
    This database has been featured in news media, and indeed in several decisions dealing with hallucinated material.
  • F8 Damien Charlotin — AI Hallucination Cases Database, opening ¶2, footnote 2 documented · field
    Examples of media coverage include: … M. Hiltzik, AI 'hallucinations' are a growing problem for the legal profession (LA Times, 22 May 2025)
  • F57 Wikipedia — Hallucination (artificial intelligence), In legal filings / Canada documented · field
    As of 14 June 2026, Canadian courts and tribunals have received at least 167 filings containing AI-hallucinated, fictitious citations, across 51 courts and tribunals.
  • F58 Wikipedia — Hallucination (artificial intelligence), In legal filings / Israel documented · field
    As of August 2026, Israeli courts and tribunals had identified at least 55 cases in which parties submitted documents containing fictitious citations or otherwise AI-hallucinated arguments.
  • F59 Wikipedia — Mata v. Avianca, Inc., Impact ¶3 documented · field
    Due to the continued usage of GAI in the practice of law, Mata has been described as a landmark case by legal professionals,
  • F55 Wikipedia — Artificial intelligence, Applications / Other industry-specific tasks documented · field
    By 2026, judges had issued sanctions and bar associations had issued warnings due to attorney submissions to the courts containing fabricated case law citations hallucinated by AI tools.
22.On the Overview's video cards it appears at title grain: KARE 11's "How common are AI hallucinations in court cases?" and Miller Law Group's "AI Hallucinations Got an Attorney Disbarred".2
  • F37 YouTube·KARE 11 — How common are AI hallucinations in court cases?, oEmbed title (YouTube, KARE 11, 1:15) documented · field
    How common are AI hallucinations in court cases?
  • F38 YouTube·Miller Law Group — AI Hallucinations Got an Attorney Disbarred, oEmbed title (YouTube, Miller Law Group, 0:53) documented · field
    AI Hallucinations Got an Attorney Disbarred
23.HAQQ, which discloses that it "sells a legal AI product", re-reads the live database monthly and takes off its page any number it cannot re-verify, and lists sanctions from revoked admissions to personal costs, the largest it can source about $109,700 (HAQQ); the MMRS record enters it as a candidate, "a vendor tracker built on Charlotin's count".4
  • F35 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, Why do lawyers keep filing fake AI citations? documented · field
    (HAQQ ran that benchmark and sells a legal AI product, so weigh our numbers accordingly)
  • F34 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, How is this tracker kept current? documented · field
    Once a month we re-read the live database and primary reporting and check four things: the total count, the largest sourced penalty, new landmark decisions (appellate, cross-border or a new kind of sanction) and the implied daily rate. A number we cannot re-verify comes off the page.
  • F33 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, How have AI sanctions escalated? documented · field
    The 2025 and 2026 decisions add revoked admissions, regulator referrals, a contempt finding, a canceled trial, district suspensions and personal costs against the lawyer who signed without checking. … Largest single-matter penalty we can source: about $109,700 in sanctions and fees in Couvrette v. Wisnovsky, D. Oregon (ABA Journal, 2026).
  • MMRS-25 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: candidates (surfaced by ai-hallucination-cases-database-aio-20261029) interpretation
    HAQQ — AI Hallucination Cases: The 2,202-Case Sanctions Tracker … a vendor tracker built on Charlotin's count
24.Matthew Lee, a barrister at Doughty Street Chambers, keeps at Natural and Artificial Law an international tracker of "Selected judicial quotations" on AI hallucination cases and fabricated or false citations, first published 16 May 2025, which "does not measure how often these issues occur", and a separate UK tracker of case records, outcomes, quotations and sources in which "inclusion is not proof of an AI hallucination or wrongdoing"; neither page names Charlotin's database, which the MMRS record's candidate list enters as "a UK companion to Charlotin's database".5
  • F26 Natural and Artificial Law — AI Hallucination Cases Tracker, international page head documented · field
    International AI hallucination cases tracker … Selected judicial quotations on AI hallucination cases and fabricated/false citations from judgments and decisions across jurisdictions. … By Matthew Lee · Barrister, Doughty Street Chambers … First published: 16 May 2025
  • F27 Natural and Artificial Law — AI Hallucination Cases Tracker, The reason for this collection documented · field
    The collection is selective and does not measure how often these issues occur or establish a worldwide consensus.
  • F24 Natural and Artificial Law — AI Hallucination Cases Tracker, UK box documented · field
    The detailed UK AI Hallucination Cases Tracker … For UK AI hallucination cases, the dedicated UK tracker brings together case records, recorded outcomes, judicial quotations and sources, alongside figures and charts drawn from my fuller research.
  • F25 Natural and Artificial Law — AI Hallucination Cases Tracker, UK box documented · field
    It includes confirmed, suspected and disputed issues: inclusion is not proof of an AI hallucination or wrongdoing.
  • MMRS-24 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: candidates (surfaced by ai-hallucination-cases-database-aio-20261029) interpretation
    AI Hallucination Cases Tracker (UK), Natural and Artificial Law … a UK companion to Charlotin's database
25.The Capture Registry (2026-10-29) holds the UK tracker a separate aggregator and HAQQ's tracker, which gives the database's 2,202 decisions of 19 October (HAQQ), built on Charlotin's count, both added as candidates the census did not hold, and reads the cards as the database "already aggregated in turn: a regional companion and a vendor tracker counting its cases".3
  • CAP-1-03 capture-registry Capture Registry (EA-WG-CAPTURES-01), entry ai-hallucination-cases-database-aio-20261029 (OBS-4f95ab35a3ac, AXN:0AA6.CAP Lee Sharks (the registry) · 2026-10-29 · ai-hallucination-cases-database-aio-20261029, findings[2] documented
    TWO NEIGHBOURS. The UK tracker at Natural and Artificial Law is a separate aggregator; HAQQ's '2,202-case' tracker is built on Charlotin's count. Both added as candidates; the census held neither.
  • F28 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, lede ('In short') documented · field
    In short: Damien Charlotin's AI Hallucination Cases database lists 2,202 court and tribunal decisions involving AI-fabricated citations or content, as of its 19 October 2026 update.
  • CAP-1-06 capture-registry Capture Registry (EA-WG-CAPTURES-01), entry ai-hallucination-cases-database-aio-20261029 (OBS-4f95ab35a3ac, AXN:0AA6.CAP Lee Sharks (the registry) · 2026-10-29 · ai-hallucination-cases-database-aio-20261029, analysis s2 interpretation
    The cards show the database already aggregated in turn: a regional companion and a vendor tracker counting its cases.
26.The MMRS record keeps itself apart from the entity, each assertion with a source and a basis and the lifecycle apart from the observation that saw it, records the database as active on 28 October 2026 with the roles of monitoring and reception, and relates it to the composition layer's account seated in the Capture Registry.3
  • MMRS-26 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: schema_note (v2, 2026-10-28) stipulation
    each page has two nodes, the MMRS record and the entity it describes; relations are typed; each assertion carries a source and a basis (operator statement, third-party report, our observation, our reading); lifecycle is kept apart from the observation that saw it
  • MMRS-14 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: kind, roles, lifecycle, observed documented
    database … monitoring … reception … active … 2026-10-28
  • MMRS-23 MMRS MMRS meta-aggregator record: AI Hallucination Cases (census row; https://www.machinemediation.org/aggregators/ai-halluci Lee Sharks (editor) · 2026-10-28 (corrected 2026-10-29) · census: relations[0] (capture) documented
    the composition layer's account of the entity, seated in the Capture Registry
27.There (Capture Registry, 2026-10-29) the Overview at 'ai hallucination cases database' composes the database with its maker and at its size, Charlotin and 'over 2,200' being right against the 2,231 its page gives, as the field's primary record; it narrows the admission rule, which the page states as reliance the court "has explicitly found (or implied)", to 'explicitly', so that the implied cases are dropped, and lists private lawyers first where the page's filters give 1,288 pro se litigants and 880 lawyers.7
  • CAP-1-01 capture-registry Capture Registry (EA-WG-CAPTURES-01), entry ai-hallucination-cases-database-aio-20261029 (OBS-4f95ab35a3ac, AXN:0AA6.CAP Lee Sharks (the registry) · 2026-10-29 · ai-hallucination-cases-database-aio-20261029, findings[0] documented
    THE MAKER AND THE SIZE. Damien Charlotin and 'over 2,200' (the record: 2,231 on 28 October) are right. Checked 2026-10-29 against the MMRS meta-aggregator record of 2026-10-28 and the entity's own pages, re-read the same day.
  • F6 Damien Charlotin — AI Hallucination Cases Database, opening ¶2 documented · field
    While seeking to be exhaustive (2231 cases identified so far), it is a work in progress and will expand as new examples emerge.
  • CAP-1-05 capture-registry Capture Registry (EA-WG-CAPTURES-01), entry ai-hallucination-cases-database-aio-20261029 (OBS-4f95ab35a3ac, AXN:0AA6.CAP Lee Sharks (the registry) · 2026-10-29 · ai-hallucination-cases-database-aio-20261029, analysis s1 interpretation
    The database is composed with its maker, at its size, as the field's primary record, and its admission rule is narrowed from 'finds or implies' to 'explicitly'.
  • CAP-1-02 capture-registry Capture Registry (EA-WG-CAPTURES-01), entry ai-hallucination-cases-database-aio-20261029 (OBS-4f95ab35a3ac, AXN:0AA6.CAP Lee Sharks (the registry) · 2026-10-29 · ai-hallucination-cases-database-aio-20261029, findings[1] interpretation
    THE SCOPE NARROWED TO EXPLICIT. 'Where generative AI explicitly produced hallucinated content' sharpens the database's rule, which admits decisions where the court 'explicitly finds, or implies' reliance on hallucinated material. The implied cases are dropped.
  • F3 Damien Charlotin — AI Hallucination Cases Database, opening ¶1, footnote 1 ¶2 documented · field
    Notably, this does not cover mere allegations of hallucinations, but only cases where the court or tribunal has explicitly found (or implied) that a party relied on hallucinated content or material.
  • CAP-1-04 capture-registry Capture Registry (EA-WG-CAPTURES-01), entry ai-hallucination-cases-database-aio-20261029 (OBS-4f95ab35a3ac, AXN:0AA6.CAP Lee Sharks (the registry) · 2026-10-29 · ai-hallucination-cases-database-aio-20261029, findings[3] documented
    THE PARTIES' ORDER. The record gives 1,288 pro se and 880 lawyers; the composition lists private lawyers first.
  • F13 Damien Charlotin — AI Hallucination Cases Database, filters: Party documented · field
    Expert (17) … Judge (32) … Lawyer (880) … Prosecutor (5) … Pro Se Litigant (1288)

the compression: AIO's interaction grammar (lede, headed clusters, bolded labels, card rail), composed from the v0.9 plan in one claim space; it faces on the card, with AIO's transcript a record within it. Composed under v0.9, equal case (ρ = extends): KO_B sentences surviving 0 of 10; every field claim carried. composed 2026-10-29 from the v0.9 knowledge object; not frozen

Compression · The field's ontology — L_F(B)ai hallucination cases database

AI Hallucination Cases is a database that tracks legal decisions in which a court or tribunal has explicitly found (or implied) that a party relied on AI-hallucinated content, typically fake citations (its page): 2,231 cases as of 28 October 2026.

📋 What it records

  • Admission: the courts decide, so it undercounts (FAQ); some alleged decisions admitted as judgment calls (its page).1↘
    It covers only cases where the court or tribunal has explicitly found (or implied) reliance on hallucinated material, the maker letting the courts make or imply the judgment so that the database is necessarily an undercount (its page; FAQ; HAQQ), with some alleged but unconfirmed decisions, and alleged hallucinations of judges, as judgment calls, though the FAQ says he refrains from rows only alleged, most hallucinations being obvious.§2
  • Fields: court, party, tool as disclosed, nature, outcome, penalty (its page).2↘
    It had identified 2,231 cases by 28 October 2026, 1,514 from the USA and 1,288 involving pro se litigants against 880 lawyers, with HAQQ's 2,202 on 19 October, 1,501 American; the nature of each hallucination is fabricated, false quotes, misrepresented or outdated advice (its filters; HAQQ).§5 Each record carries the court, date, party, AI tool as disclosed, nature, outcome, penalty and reports, a penalty of 1 being a placeholder, and the page warns that a named tool is not necessarily responsible and that automatically extracted dates and responses are indicative (its page).§6

📈 Size and origin

  • Counts: USA 1,514; pro se 1,288, lawyers 880; HAQQ 2,202 (19 October).1↘
    It had identified 2,231 cases by 28 October 2026, 1,514 from the USA and 1,288 involving pro se litigants against 880 lawyers, with HAQQ's 2,202 on 19 October, 1,501 American; the nature of each hallucination is fabricated, false quotes, misrepresented or outdated advice (its filters; HAQQ).§5
  • Origin: Charlotin, April 2025, a Sciences Po course (FAQ; Wikipedia).2↘
    Damien Charlotin started it in April 2025 while teaching at Sciences Po and maintains it on his personal website (FAQ), and Wikipedia gives its establishment in April 2025 by the HEC Paris and Sciences Po lecturer; its period filter begins in Q2 2023.§3 From two or three cases a month before 2025 it reached five a day by February 2026 (FAQ), with over 1,300 a year after its start (Wikipedia) and HAQQ's series from about 200 to 2,202, updated daily (its page); the FAQ reads the growth through judicial lag and LLM availability, the US share through its legal data, and the records as mostly pure mistakes.§7
  • Growth: five a day by February 2026 (FAQ).1↘
    From two or three cases a month before 2025 it reached five a day by February 2026 (FAQ), with over 1,300 a year after its start (Wikipedia) and HAQQ's series from about 200 to 2,202, updated daily (its page); the FAQ reads the growth through judicial lag and LLM availability, the US share through its legal data, and the records as mostly pure mistakes.§7
  • Boundary: not the wider universe of fake citations; a floor (its page; HAQQ).1↘
    It does not track the wider universe of all fake citations or AI use in court filings (its page), and HAQQ calls its count a floor.§4

🗂️ Around it

  • Use: CC BY 4.0, CSV; practitioners, benchmarks, PelAIkan (its page; FAQ).2↘
    From two or three cases a month before 2025 it reached five a day by February 2026 (FAQ), with over 1,300 a year after its start (Wikipedia) and HAQQ's series from about 200 to 2,202, updated daily (its page); the FAQ reads the growth through judicial lag and LLM availability, the US share through its legal data, and the records as mostly pure mistakes.§7 Cases come from referrals, scrapers and keyword searches, and from readers, through an AI-assisted pipeline (FAQ; its page); it is CC BY 4.0 with a CSV, serves practitioners and benchmarks, underlies the PelAIkan checker, and its maker expects no fix at the model stage and finds that hallucinations expose a profession that cited without reading (FAQ).§8
  • Neighbours: HAQQ's re-count; Matthew Lee's judicial quotations and UK tracker.1↘
    Beside it stand HAQQ's sanctions tracker, a vendor's monthly re-count that lists sanctions up to about $109,700, and Matthew Lee's international tracker of selected judicial quotations at Natural and Artificial Law, which measures no frequency, with a separate UK tracker whose inclusion is not proof (HAQQ; Natural and Artificial Law).§10
  • Reception: news, decisions, Wikipedia, two videos.1↘
    It has been featured in news media and in court decisions (its page), and Wikipedia cites it for Canadian and Israeli counts and Mata v. Avianca, records sanctions by 2026, and the Overview's cards include a LinkedIn post at 1,600 cases and two videos by title.§9
1what it is: legal decisions on AI hallucinationsDamien Charlotin — AI Hallucination Cases Database2 claims · B1
  • F1 Damien Charlotin — AI Hallucination Cases Database, opening ¶1 documented · field
    This database tracks legal decisions … in cases where generative AI produced hallucinated content – typically fake citations, but also other types of AI-generated arguments.
  • F22 Damien Charlotin — AI Hallucination Cases Database, meta description (attribute text) documented · field
    The most comprehensive database of AI hallucination cases in law: legal decisions from courts worldwide, searchable by country, party, AI tool, and outcome. Updated daily.
2maker and originArtificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ5 claims · B1, B7, B8, B9
  • F16 Damien Charlotin — AI Hallucination Cases Database, filters: From period documented · field
    From period: Q2 2023
  • F39 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, ¶1 documented · field
    As some of you know, I am maintaining an AI Hallucinations Cases database on my personal website.
  • F40 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, When did you start the database, and why ? documented · field
    April 2025. I was teaching this course to sorry Sciences Po Law School students, discussing in particular the “Limits and Potentials” of LLMs in the legal domain, when we started touching on the phenomenon of hallucinations. … I looked out for actual data here. Since there was none, … I figured, “hey, let’s tally the cases myself”.
  • F54 Wikipedia — Artificial intelligence, Applications / Other industry-specific tasks documented · field
    The use of generative AI by law firms for legal research resulted in the creation of the global "AI Hallucination Cases" database, in April 2025, established by HEC Paris and Sciences Po legal data analysis lecturer Damien Charlotin.
  • F56 Wikipedia — Hallucination (artificial intelligence), In legal filings / United States ¶1 documented · field
    A database of incidents, "AI Hallucination Cases", was established in April 2025 by HEC Paris and Sciences Po legal data analysis lecturer Damien Charlotin; one year later, it listed over 1300 instances of hallucinations in legal decisions.
3the unit and the admission ruleDamien Charlotin — AI Hallucination Cases Database5 claims · B1, B3, B7
  • F2 Damien Charlotin — AI Hallucination Cases Database, opening ¶1, footnote 1 ¶1 documented · field
    I.e., all documents where the use of AI, whether established or merely alleged, is addressed in more than a passing reference by the court or tribunal.
  • F3 Damien Charlotin — AI Hallucination Cases Database, opening ¶1, footnote 1 ¶2 documented · field
    Notably, this does not cover mere allegations of hallucinations, but only cases where the court or tribunal has explicitly found (or implied) that a party relied on hallucinated content or material.
  • F29 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, How many AI hallucination cases are there? documented · field
    The database is maintained by Damien Charlotin, a research fellow at HEC Paris. Its inclusion bar is strict: a decision is listed only where a court or tribunal found, or clearly implied, that a party relied on hallucinated material. Accusations alone do not count.
  • F44 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, But then, how do you know a case actually involves an hallucination ? documented · field
    That’s the point: I am not making that judgment, I let the courts and judges make or imply it, which is why the database is necessarily an undercount.
  • F46 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, But then, how do you know a case actually involves an hallucination ? documented · field
    by their nature, most hallucinations are very obvious, making up a case name or a false quote is not, cannot be a human mistake
4exceptions: judgment callsDamien Charlotin — AI Hallucination Cases Database3 claims · B1, B7
  • F4 Damien Charlotin — AI Hallucination Cases Database, opening ¶1, footnote 1 ¶3 documented · field
    As an exception, the database also covers some judicial decisions where AI use was alleged but not confirmed. This is a judgment call on my part.
  • F45 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, But then, how do you know a case actually involves an hallucination ? documented · field
    It’s also why I refrain from adding rows about cases where hallucinations are only alleged
  • F47 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, But then, how do you know … ? (edit, Feb 2026) documented · field
    [Edit, Feb 2026: I should add an exception here, in cases where the alleged hallucination comes from a judge: absent an appeal court decision or an official retractation, I am bound to make a judgment call.]
5boundary: what it does not trackDamien Charlotin — AI Hallucination Cases Database2 claims · B1, B3
  • F5 Damien Charlotin — AI Hallucination Cases Database, opening ¶1 documented · field
    It does not track the (necessarily wider) universe of all fake citations or use of AI in court filings.
  • F30 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, How many AI hallucination cases are there? (caveats) documented · field
    First, it counts only what a judge caught and wrote up; a fake citation nobody checks never reaches the database, so 2,202 is a floor.
6the record: fields and categoriesDamien Charlotin — AI Hallucination Cases Database4 claims · B1
  • F15 Damien Charlotin — AI Hallucination Cases Database, filters: Nature – Category documented · field
    Fabricated (1829) … False Quotes (595) … Misrepresented (947) … Outdated Advice (38)
  • F17 Damien Charlotin — AI Hallucination Cases Database, table header documented · field
    Court / Jurisdiction … Party Using AI … AI Tool … Nature of Hallucination … Outcome / Sanction … Monetary Penalty … Details … Report(s)
  • F21 Damien Charlotin — AI Hallucination Cases Database, Monetary sanction note (attribute text) documented · field
    A monetary penalty recorded as 1 is a placeholder, not the real figure: the court imposed a monetary sanction but the amount is unknown to us.
  • F23 Damien Charlotin — AI Hallucination Cases Database, filters: outcome documented · field
    Monetary sanction … Disciplinary Referral
7the record's stated limitsDamien Charlotin — AI Hallucination Cases Database3 claims · B1
  • F18 Damien Charlotin — AI Hallucination Cases Database, AI Tool column note (attribute text) documented · field
    This database tracks AI tools only as disclosed or admitted by parties in court filings. If AI use was acknowledged but no specific tool was named, the entry reads 'Unidentified.' Otherwise, the default value is 'Implied' when AI use is evident but not explicitly confirmed.
  • F19 Damien Charlotin — AI Hallucination Cases Database, AI Tool column note (attribute text) documented · field
    Note: The mention of a specific tool does not necessarily mean that tool was responsible for the hallucinations in question.
  • F20 Damien Charlotin — AI Hallucination Cases Database, graph notes (attribute text) documented · field
    The date of the offending document is parsed automatically from court records and may occasionally be wrong. … These responses are extracted automatically from the decisions and simplified into set categories, so treat them as indicative rather than exact.
8count and compositionDamien Charlotin — AI Hallucination Cases Database5 claims · B1, B3
  • F6 Damien Charlotin — AI Hallucination Cases Database, opening ¶2 documented · field
    While seeking to be exhaustive (2231 cases identified so far), it is a work in progress and will expand as new examples emerge.
  • F13 Damien Charlotin — AI Hallucination Cases Database, filters: Party documented · field
    Expert (17) … Judge (32) … Lawyer (880) … Prosecutor (5) … Pro Se Litigant (1288)
  • F14 Damien Charlotin — AI Hallucination Cases Database, filters: State documented · field
    Australia (112) … Canada (238) … UK (82) … USA (1514)
  • F28 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, lede ('In short') documented · field
    In short: Damien Charlotin's AI Hallucination Cases database lists 2,202 court and tribunal decisions involving AI-fabricated citations or content, as of its 19 October 2026 update.
  • F31 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, Key facts documented · field
    By country: United States 1,501; Canada 234; Australia 112; United Kingdom 76; … By filer: pro se litigants 1,267; lawyers 872; judges 32; experts 17 (Charlotin database party filter, 19 October 2026).
9growthArtificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ2 claims · B3, B7
  • F32 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, Key facts documented · field
    Growth: about 200 cases in mid-2025, 719 in January 2026 (Scientific American, 2026), 1,227 in early April 2026 (PlatinumIDS, April 2026), 1,458 on 22 May, 1,598 on 9 June, 2,046 on 21 September and 2,202 on 19 October 2026 (HAQQ checks of the live database).
  • F41 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, What do you mean by “surge” ? documented · field
    I mean that pre-2025, we maybe had two or three cases a month; now that’s below the daily average. … daily average is now five per day.
10causes and coverage: the maker's readingArtificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ3 claims · B7
  • F42 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, Why the acceleration then ? documented · field
    A combination of factors, including the lag in judicial times … This matches the profile of most cases: either self-represented litigants, or lawyers who are surprised that an existing tool suddenly has an AI component that hallucinates.
  • F48 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, Why so many entries come from the USA ? documented · field
    ‘Murica is blessed - and I mean it - with an excellent legal data ecosystem. … In many countries, especially European countries, legal data - though supposedly public - is hoarded by legal editors
  • F49 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, Any other trends in the data ? documented · field
    one rather evident divisio stands between pure mistakes … the vast majority of cases, and the (substantial) minority of records that involve, for lack of a better word, “bad” actors.
11intake and pipelineArtificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ3 claims · B1, B7
  • F9 Damien Charlotin — AI Hallucination Cases Database, opening ¶3 documented · field
    And if you know of a case that should be included, feel free to … contact me.
  • F43 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, How do you find the cases ? documented · field
    A mix of referrals from benevolent randos on the internet … use of dedicated scrapers and bots to automatically monitor some data sources … and good old database searches with, wait for it, keywords.
  • F50 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, When do you intend to stop ? documented · field
    I currently have a rather efficient pipeline to process new entries - which in fact involve the use of AI, though I am careful to check it does not hallucinate.
12openness: licence and dataDamien Charlotin — AI Hallucination Cases Database2 claims · B1
  • F11 Damien Charlotin — AI Hallucination Cases Database, download and update line documented · field
    Click to Download CSV … Last updated: 28 October 2026
  • F12 Damien Charlotin — AI Hallucination Cases Database, Licence box documented · field
    CC BY 4.0 — free to reuse, including commercially, with attribution. … Cite as: AI Hallucination Cases Database, Damien Charlotin,
13purpose and usesArtificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ3 claims · B1, B7
  • F10 Damien Charlotin — AI Hallucination Cases Database, PelAIkan box documented · field
    Based on this database, I have developed an automated reference checker that also detects hallucinations: PelAIkan.
  • F51 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, What’s the point of the database ultimately ? documented · field
    Intrisic value: practitioners use it to find out what cases are relevant in their own jurisdiction. … And then all these hallucinated cases can serve as benchmarks to fix the issue.
  • F52 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, Because you expect this to be fixed ? documented · field
    likely not at the model stage, no … I don’t think we can ever reduce it to zero given the existing paradigm.
14citation fidelityArtificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ1 claim · B7
  • F53 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, Anything else ? documented · field
    For years, we (me included) have cited without reading; but now the costs of that practice have become explicit. In other words, hallucinations expose the epistemic hygiene the legal profession has long lacked, and that is precisely why they deserve to be studied.
15reception: press, courts, encyclopedia, videoDamien Charlotin — AI Hallucination Cases Database9 claims · B1, B10, B4, B5, B6, B8, B9
  • F7 Damien Charlotin — AI Hallucination Cases Database, opening ¶2 documented · field
    This database has been featured in news media, and indeed in several decisions dealing with hallucinated material.
  • F8 Damien Charlotin — AI Hallucination Cases Database, opening ¶2, footnote 2 documented · field
    Examples of media coverage include: … M. Hiltzik, AI 'hallucinations' are a growing problem for the legal profession (LA Times, 22 May 2025)
  • F36 LinkedIn — George Hannah's Post, card snippet (LinkedIn; post not found) documented · field
    George Hannah 4mo There is now a database tracking every AI hallucination to surface in court. It has logged 1,600 cases so far.
  • F37 YouTube·KARE 11 — How common are AI hallucinations in court cases?, oEmbed title (YouTube, KARE 11, 1:15) documented · field
    How common are AI hallucinations in court cases?
  • F38 YouTube·Miller Law Group — AI Hallucinations Got an Attorney Disbarred, oEmbed title (YouTube, Miller Law Group, 0:53) documented · field
    AI Hallucinations Got an Attorney Disbarred
  • F55 Wikipedia — Artificial intelligence, Applications / Other industry-specific tasks documented · field
    By 2026, judges had issued sanctions and bar associations had issued warnings due to attorney submissions to the courts containing fabricated case law citations hallucinated by AI tools.
  • F57 Wikipedia — Hallucination (artificial intelligence), In legal filings / Canada documented · field
    As of 14 June 2026, Canadian courts and tribunals have received at least 167 filings containing AI-hallucinated, fictitious citations, across 51 courts and tribunals.
  • F58 Wikipedia — Hallucination (artificial intelligence), In legal filings / Israel documented · field
    As of August 2026, Israeli courts and tribunals had identified at least 55 cases in which parties submitted documents containing fictitious citations or otherwise AI-hallucinated arguments.
  • F59 Wikipedia — Mata v. Avianca, Inc., Impact ¶3 documented · field
    Due to the continued usage of GAI in the practice of law, Mata has been described as a landmark case by legal professionals,
16neighbour: HAQQ's sanctions trackerHAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ3 claims · B3
  • F33 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, How have AI sanctions escalated? documented · field
    The 2025 and 2026 decisions add revoked admissions, regulator referrals, a contempt finding, a canceled trial, district suspensions and personal costs against the lawyer who signed without checking. … Largest single-matter penalty we can source: about $109,700 in sanctions and fees in Couvrette v. Wisnovsky, D. Oregon (ABA Journal, 2026).
  • F34 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, How is this tracker kept current? documented · field
    Once a month we re-read the live database and primary reporting and check four things: the total count, the largest sourced penalty, new landmark decisions (appellate, cross-border or a new kind of sanction) and the implied daily rate. A number we cannot re-verify comes off the page.
  • F35 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, Why do lawyers keep filing fake AI citations? documented · field
    (HAQQ ran that benchmark and sells a legal AI product, so weigh our numbers accordingly)
17neighbour: Natural and Artificial Law's trackersNatural and Artificial Law — AI Hallucination Cases Tracker4 claims · B2
  • F24 Natural and Artificial Law — AI Hallucination Cases Tracker, UK box documented · field
    The detailed UK AI Hallucination Cases Tracker … For UK AI hallucination cases, the dedicated UK tracker brings together case records, recorded outcomes, judicial quotations and sources, alongside figures and charts drawn from my fuller research.
  • F25 Natural and Artificial Law — AI Hallucination Cases Tracker, UK box documented · field
    It includes confirmed, suspected and disputed issues: inclusion is not proof of an AI hallucination or wrongdoing.
  • F26 Natural and Artificial Law — AI Hallucination Cases Tracker, international page head documented · field
    International AI hallucination cases tracker … Selected judicial quotations on AI hallucination cases and fabricated/false citations from judgments and decisions across jurisdictions. … By Matthew Lee · Barrister, Doughty Street Chambers … First published: 16 May 2025
  • F27 Natural and Artificial Law — AI Hallucination Cases Tracker, The reason for this collection documented · field
    The collection is selective and does not measure how often these issues occur or establish a worldwide consensus.
Expansion · The field's ontology — L_F(B)10 sentences · every one sourced below

AI Hallucination Cases

AI Hallucination Cases tracks legal decisions in cases where generative AI produced hallucinated content, typically fake citations, describing itself as the most comprehensive database of AI hallucination cases in law, and its decision is any document in which a court or tribunal addresses AI use in more than a passing reference (its page). It covers only cases where the court or tribunal has explicitly found (or implied) reliance on hallucinated material, the maker letting the courts make or imply the judgment so that the database is necessarily an undercount (its page; FAQ; HAQQ), with some alleged but unconfirmed decisions, and alleged hallucinations of judges, as judgment calls, though the FAQ says he refrains from rows only alleged, most hallucinations being obvious.

Damien Charlotin started it in April 2025 while teaching at Sciences Po and maintains it on his personal website (FAQ), and Wikipedia gives its establishment in April 2025 by the HEC Paris and Sciences Po lecturer; its period filter begins in Q2 2023. It does not track the wider universe of all fake citations or AI use in court filings (its page), and HAQQ calls its count a floor.

It had identified 2,231 cases by 28 October 2026, 1,514 from the USA and 1,288 involving pro se litigants against 880 lawyers, with HAQQ's 2,202 on 19 October, 1,501 American; the nature of each hallucination is fabricated, false quotes, misrepresented or outdated advice (its filters; HAQQ). Each record carries the court, date, party, AI tool as disclosed, nature, outcome, penalty and reports, a penalty of 1 being a placeholder, and the page warns that a named tool is not necessarily responsible and that automatically extracted dates and responses are indicative (its page).

From two or three cases a month before 2025 it reached five a day by February 2026 (FAQ), with over 1,300 a year after its start (Wikipedia) and HAQQ's series from about 200 to 2,202, updated daily (its page); the FAQ reads the growth through judicial lag and LLM availability, the US share through its legal data, and the records as mostly pure mistakes. Cases come from referrals, scrapers and keyword searches, and from readers, through an AI-assisted pipeline (FAQ; its page); it is CC BY 4.0 with a CSV, serves practitioners and benchmarks, underlies the PelAIkan checker, and its maker expects no fix at the model stage and finds that hallucinations expose a profession that cited without reading (FAQ).

It has been featured in news media and in court decisions (its page), and Wikipedia cites it for Canadian and Israeli counts and Mata v. Avianca, records sanctions by 2026, and the Overview's cards include a LinkedIn post at 1,600 cases and two videos by title. Beside it stand HAQQ's sanctions tracker, a vendor's monthly re-count that lists sanctions up to about $109,700, and Matthew Lee's international tracker of selected judicial quotations at Natural and Artificial Law, which measures no frequency, with a separate UK tracker whose inclusion is not proof (HAQQ; Natural and Artificial Law).

Provenance — every sentence sourced10 sentences

10 sentences; 59 field claims, 0 archive claims. Modality is the source's own; the prose carries it in its grammar.

1.AI Hallucination Cases tracks legal decisions in cases where generative AI produced hallucinated content, typically fake citations, describing itself as the most comprehensive database of AI hallucination cases in law, and its decision is any document in which a court or tribunal addresses AI use in more than a passing reference (its page).3
  • F1 Damien Charlotin — AI Hallucination Cases Database, opening ¶1 documented · field
    This database tracks legal decisions … in cases where generative AI produced hallucinated content – typically fake citations, but also other types of AI-generated arguments.
  • F22 Damien Charlotin — AI Hallucination Cases Database, meta description (attribute text) documented · field
    The most comprehensive database of AI hallucination cases in law: legal decisions from courts worldwide, searchable by country, party, AI tool, and outcome. Updated daily.
  • F2 Damien Charlotin — AI Hallucination Cases Database, opening ¶1, footnote 1 ¶1 documented · field
    I.e., all documents where the use of AI, whether established or merely alleged, is addressed in more than a passing reference by the court or tribunal.
2.It covers only cases where the court or tribunal has explicitly found (or implied) reliance on hallucinated material, the maker letting the courts make or imply the judgment so that the database is necessarily an undercount (its page; FAQ; HAQQ), with some alleged but unconfirmed decisions, and alleged hallucinations of judges, as judgment calls, though the FAQ says he refrains from rows only alleged, most hallucinations being obvious.7
  • F3 Damien Charlotin — AI Hallucination Cases Database, opening ¶1, footnote 1 ¶2 documented · field
    Notably, this does not cover mere allegations of hallucinations, but only cases where the court or tribunal has explicitly found (or implied) that a party relied on hallucinated content or material.
  • F44 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, But then, how do you know a case actually involves an hallucination ? documented · field
    That’s the point: I am not making that judgment, I let the courts and judges make or imply it, which is why the database is necessarily an undercount.
  • F29 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, How many AI hallucination cases are there? documented · field
    The database is maintained by Damien Charlotin, a research fellow at HEC Paris. Its inclusion bar is strict: a decision is listed only where a court or tribunal found, or clearly implied, that a party relied on hallucinated material. Accusations alone do not count.
  • F4 Damien Charlotin — AI Hallucination Cases Database, opening ¶1, footnote 1 ¶3 documented · field
    As an exception, the database also covers some judicial decisions where AI use was alleged but not confirmed. This is a judgment call on my part.
  • F45 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, But then, how do you know a case actually involves an hallucination ? documented · field
    It’s also why I refrain from adding rows about cases where hallucinations are only alleged
  • F47 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, But then, how do you know … ? (edit, Feb 2026) documented · field
    [Edit, Feb 2026: I should add an exception here, in cases where the alleged hallucination comes from a judge: absent an appeal court decision or an official retractation, I am bound to make a judgment call.]
  • F46 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, But then, how do you know a case actually involves an hallucination ? documented · field
    by their nature, most hallucinations are very obvious, making up a case name or a false quote is not, cannot be a human mistake
3.Damien Charlotin started it in April 2025 while teaching at Sciences Po and maintains it on his personal website (FAQ), and Wikipedia gives its establishment in April 2025 by the HEC Paris and Sciences Po lecturer; its period filter begins in Q2 2023.5
  • F40 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, When did you start the database, and why ? documented · field
    April 2025. I was teaching this course to sorry Sciences Po Law School students, discussing in particular the “Limits and Potentials” of LLMs in the legal domain, when we started touching on the phenomenon of hallucinations. … I looked out for actual data here. Since there was none, … I figured, “hey, let’s tally the cases myself”.
  • F39 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, ¶1 documented · field
    As some of you know, I am maintaining an AI Hallucinations Cases database on my personal website.
  • F54 Wikipedia — Artificial intelligence, Applications / Other industry-specific tasks documented · field
    The use of generative AI by law firms for legal research resulted in the creation of the global "AI Hallucination Cases" database, in April 2025, established by HEC Paris and Sciences Po legal data analysis lecturer Damien Charlotin.
  • F56 Wikipedia — Hallucination (artificial intelligence), In legal filings / United States ¶1 documented · field
    A database of incidents, "AI Hallucination Cases", was established in April 2025 by HEC Paris and Sciences Po legal data analysis lecturer Damien Charlotin; one year later, it listed over 1300 instances of hallucinations in legal decisions.
  • F16 Damien Charlotin — AI Hallucination Cases Database, filters: From period documented · field
    From period: Q2 2023
4.It does not track the wider universe of all fake citations or AI use in court filings (its page), and HAQQ calls its count a floor.2
  • F5 Damien Charlotin — AI Hallucination Cases Database, opening ¶1 documented · field
    It does not track the (necessarily wider) universe of all fake citations or use of AI in court filings.
  • F30 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, How many AI hallucination cases are there? (caveats) documented · field
    First, it counts only what a judge caught and wrote up; a fake citation nobody checks never reaches the database, so 2,202 is a floor.
5.It had identified 2,231 cases by 28 October 2026, 1,514 from the USA and 1,288 involving pro se litigants against 880 lawyers, with HAQQ's 2,202 on 19 October, 1,501 American; the nature of each hallucination is fabricated, false quotes, misrepresented or outdated advice (its filters; HAQQ).6
  • F6 Damien Charlotin — AI Hallucination Cases Database, opening ¶2 documented · field
    While seeking to be exhaustive (2231 cases identified so far), it is a work in progress and will expand as new examples emerge.
  • F14 Damien Charlotin — AI Hallucination Cases Database, filters: State documented · field
    Australia (112) … Canada (238) … UK (82) … USA (1514)
  • F13 Damien Charlotin — AI Hallucination Cases Database, filters: Party documented · field
    Expert (17) … Judge (32) … Lawyer (880) … Prosecutor (5) … Pro Se Litigant (1288)
  • F28 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, lede ('In short') documented · field
    In short: Damien Charlotin's AI Hallucination Cases database lists 2,202 court and tribunal decisions involving AI-fabricated citations or content, as of its 19 October 2026 update.
  • F31 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, Key facts documented · field
    By country: United States 1,501; Canada 234; Australia 112; United Kingdom 76; … By filer: pro se litigants 1,267; lawyers 872; judges 32; experts 17 (Charlotin database party filter, 19 October 2026).
  • F15 Damien Charlotin — AI Hallucination Cases Database, filters: Nature – Category documented · field
    Fabricated (1829) … False Quotes (595) … Misrepresented (947) … Outdated Advice (38)
6.Each record carries the court, date, party, AI tool as disclosed, nature, outcome, penalty and reports, a penalty of 1 being a placeholder, and the page warns that a named tool is not necessarily responsible and that automatically extracted dates and responses are indicative (its page).6
  • F17 Damien Charlotin — AI Hallucination Cases Database, table header documented · field
    Court / Jurisdiction … Party Using AI … AI Tool … Nature of Hallucination … Outcome / Sanction … Monetary Penalty … Details … Report(s)
  • F23 Damien Charlotin — AI Hallucination Cases Database, filters: outcome documented · field
    Monetary sanction … Disciplinary Referral
  • F21 Damien Charlotin — AI Hallucination Cases Database, Monetary sanction note (attribute text) documented · field
    A monetary penalty recorded as 1 is a placeholder, not the real figure: the court imposed a monetary sanction but the amount is unknown to us.
  • F18 Damien Charlotin — AI Hallucination Cases Database, AI Tool column note (attribute text) documented · field
    This database tracks AI tools only as disclosed or admitted by parties in court filings. If AI use was acknowledged but no specific tool was named, the entry reads 'Unidentified.' Otherwise, the default value is 'Implied' when AI use is evident but not explicitly confirmed.
  • F19 Damien Charlotin — AI Hallucination Cases Database, AI Tool column note (attribute text) documented · field
    Note: The mention of a specific tool does not necessarily mean that tool was responsible for the hallucinations in question.
  • F20 Damien Charlotin — AI Hallucination Cases Database, graph notes (attribute text) documented · field
    The date of the offending document is parsed automatically from court records and may occasionally be wrong. … These responses are extracted automatically from the decisions and simplified into set categories, so treat them as indicative rather than exact.
7.From two or three cases a month before 2025 it reached five a day by February 2026 (FAQ), with over 1,300 a year after its start (Wikipedia) and HAQQ's series from about 200 to 2,202, updated daily (its page); the FAQ reads the growth through judicial lag and LLM availability, the US share through its legal data, and the records as mostly pure mistakes.8
  • F41 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, What do you mean by “surge” ? documented · field
    I mean that pre-2025, we maybe had two or three cases a month; now that’s below the daily average. … daily average is now five per day.
  • F56 Wikipedia — Hallucination (artificial intelligence), In legal filings / United States ¶1 documented · field
    A database of incidents, "AI Hallucination Cases", was established in April 2025 by HEC Paris and Sciences Po legal data analysis lecturer Damien Charlotin; one year later, it listed over 1300 instances of hallucinations in legal decisions.
  • F32 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, Key facts documented · field
    Growth: about 200 cases in mid-2025, 719 in January 2026 (Scientific American, 2026), 1,227 in early April 2026 (PlatinumIDS, April 2026), 1,458 on 22 May, 1,598 on 9 June, 2,046 on 21 September and 2,202 on 19 October 2026 (HAQQ checks of the live database).
  • F11 Damien Charlotin — AI Hallucination Cases Database, download and update line documented · field
    Click to Download CSV … Last updated: 28 October 2026
  • F42 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, Why the acceleration then ? documented · field
    A combination of factors, including the lag in judicial times … This matches the profile of most cases: either self-represented litigants, or lawyers who are surprised that an existing tool suddenly has an AI component that hallucinates.
  • F48 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, Why so many entries come from the USA ? documented · field
    ‘Murica is blessed - and I mean it - with an excellent legal data ecosystem. … In many countries, especially European countries, legal data - though supposedly public - is hoarded by legal editors
  • F49 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, Any other trends in the data ? documented · field
    one rather evident divisio stands between pure mistakes … the vast majority of cases, and the (substantial) minority of records that involve, for lack of a better word, “bad” actors.
  • F36 LinkedIn — George Hannah's Post, card snippet (LinkedIn; post not found) documented · field
    George Hannah 4mo There is now a database tracking every AI hallucination to surface in court. It has logged 1,600 cases so far.
8.Cases come from referrals, scrapers and keyword searches, and from readers, through an AI-assisted pipeline (FAQ; its page); it is CC BY 4.0 with a CSV, serves practitioners and benchmarks, underlies the PelAIkan checker, and its maker expects no fix at the model stage and finds that hallucinations expose a profession that cited without reading (FAQ).8
  • F43 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, How do you find the cases ? documented · field
    A mix of referrals from benevolent randos on the internet … use of dedicated scrapers and bots to automatically monitor some data sources … and good old database searches with, wait for it, keywords.
  • F9 Damien Charlotin — AI Hallucination Cases Database, opening ¶3 documented · field
    And if you know of a case that should be included, feel free to … contact me.
  • F50 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, When do you intend to stop ? documented · field
    I currently have a rather efficient pipeline to process new entries - which in fact involve the use of AI, though I am careful to check it does not hallucinate.
  • F12 Damien Charlotin — AI Hallucination Cases Database, Licence box documented · field
    CC BY 4.0 — free to reuse, including commercially, with attribution. … Cite as: AI Hallucination Cases Database, Damien Charlotin,
  • F51 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, What’s the point of the database ultimately ? documented · field
    Intrisic value: practitioners use it to find out what cases are relevant in their own jurisdiction. … And then all these hallucinated cases can serve as benchmarks to fix the issue.
  • F10 Damien Charlotin — AI Hallucination Cases Database, PelAIkan box documented · field
    Based on this database, I have developed an automated reference checker that also detects hallucinations: PelAIkan.
  • F52 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, Because you expect this to be fixed ? documented · field
    likely not at the model stage, no … I don’t think we can ever reduce it to zero given the existing paradigm.
  • F53 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ, Anything else ? documented · field
    For years, we (me included) have cited without reading; but now the costs of that practice have become explicit. In other words, hallucinations expose the epistemic hygiene the legal profession has long lacked, and that is precisely why they deserve to be studied.
9.It has been featured in news media and in court decisions (its page), and Wikipedia cites it for Canadian and Israeli counts and Mata v. Avianca, records sanctions by 2026, and the Overview's cards include a LinkedIn post at 1,600 cases and two videos by title.8
  • F7 Damien Charlotin — AI Hallucination Cases Database, opening ¶2 documented · field
    This database has been featured in news media, and indeed in several decisions dealing with hallucinated material.
  • F8 Damien Charlotin — AI Hallucination Cases Database, opening ¶2, footnote 2 documented · field
    Examples of media coverage include: … M. Hiltzik, AI 'hallucinations' are a growing problem for the legal profession (LA Times, 22 May 2025)
  • F57 Wikipedia — Hallucination (artificial intelligence), In legal filings / Canada documented · field
    As of 14 June 2026, Canadian courts and tribunals have received at least 167 filings containing AI-hallucinated, fictitious citations, across 51 courts and tribunals.
  • F58 Wikipedia — Hallucination (artificial intelligence), In legal filings / Israel documented · field
    As of August 2026, Israeli courts and tribunals had identified at least 55 cases in which parties submitted documents containing fictitious citations or otherwise AI-hallucinated arguments.
  • F59 Wikipedia — Mata v. Avianca, Inc., Impact ¶3 documented · field
    Due to the continued usage of GAI in the practice of law, Mata has been described as a landmark case by legal professionals,
  • F55 Wikipedia — Artificial intelligence, Applications / Other industry-specific tasks documented · field
    By 2026, judges had issued sanctions and bar associations had issued warnings due to attorney submissions to the courts containing fabricated case law citations hallucinated by AI tools.
  • F37 YouTube·KARE 11 — How common are AI hallucinations in court cases?, oEmbed title (YouTube, KARE 11, 1:15) documented · field
    How common are AI hallucinations in court cases?
  • F38 YouTube·Miller Law Group — AI Hallucinations Got an Attorney Disbarred, oEmbed title (YouTube, Miller Law Group, 0:53) documented · field
    AI Hallucinations Got an Attorney Disbarred
10.Beside it stand HAQQ's sanctions tracker, a vendor's monthly re-count that lists sanctions up to about $109,700, and Matthew Lee's international tracker of selected judicial quotations at Natural and Artificial Law, which measures no frequency, with a separate UK tracker whose inclusion is not proof (HAQQ; Natural and Artificial Law).7
  • F33 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, How have AI sanctions escalated? documented · field
    The 2025 and 2026 decisions add revoked admissions, regulator referrals, a contempt finding, a canceled trial, district suspensions and personal costs against the lawyer who signed without checking. … Largest single-matter penalty we can source: about $109,700 in sanctions and fees in Couvrette v. Wisnovsky, D. Oregon (ABA Journal, 2026).
  • F34 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, How is this tracker kept current? documented · field
    Once a month we re-read the live database and primary reporting and check four things: the total count, the largest sourced penalty, new landmark decisions (appellate, cross-border or a new kind of sanction) and the implied daily rate. A number we cannot re-verify comes off the page.
  • F35 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ, Why do lawyers keep filing fake AI citations? documented · field
    (HAQQ ran that benchmark and sells a legal AI product, so weigh our numbers accordingly)
  • F26 Natural and Artificial Law — AI Hallucination Cases Tracker, international page head documented · field
    International AI hallucination cases tracker … Selected judicial quotations on AI hallucination cases and fabricated/false citations from judgments and decisions across jurisdictions. … By Matthew Lee · Barrister, Doughty Street Chambers … First published: 16 May 2025
  • F27 Natural and Artificial Law — AI Hallucination Cases Tracker, The reason for this collection documented · field
    The collection is selective and does not measure how often these issues occur or establish a worldwide consensus.
  • F24 Natural and Artificial Law — AI Hallucination Cases Tracker, UK box documented · field
    The detailed UK AI Hallucination Cases Tracker … For UK AI hallucination cases, the dedicated UK tracker brings together case records, recorded outcomes, judicial quotations and sources, alongside figures and charts drawn from my fuller research.
  • F25 Natural and Artificial Law — AI Hallucination Cases Tracker, UK box documented · field
    It includes confirmed, suspected and disputed issues: inclusion is not proof of an AI hallucination or wrongdoing.

popup — the compression from the field ledger alone (cards, own page, Wikipedia). With no archive claim admitted, the entry is the field's database at its own resolution: its page and FAQ, its neighbours' trackers, the encyclopedia's sections, and the cards. composed 2026-10-29 from the field ledger alone; not frozen

Form ledger — AIO against both arms, at both levels
AIO (T)L_F compressionL_F expansionL_A compressionL_A expansion
body words1741435083501678
distinct claims836597791
claims per 100 words4.625.211.622.05.4
field claims carried (of 59)—36594759
archive claims0003032
rail6 documents17 lineagesper sentence19 lineagesper sentence
modality shown innonetypographygrammartypographygrammar

Computed from the row at build: words counted in the text; claims from the ledger ids each line or sentence carries. T's claims are the worked example's T1–T9.

The objects

Tthe transcript174 words · 6 cards

register entry ai-hallucination-cases-database-aio-20261029 OBS-4f95ab35a3ac · file as first run sha256 0a0aaa6b60370f00…

  • T1-1 definition: 'The primary public database tracking generative AI hallucinations in court decisions is the AI Hallucination Cases Database, created and maintained by Damien Charlotin.' (markers: card 1's token and one unresolved token)
  • T1-2 focus: 'It tracks court and tribunal decisions where generative AI explicitly produced hallucinated content, most commonly fake legal citations, fabricated quotes, and non-existent case law.'
  • T1-3 scope and size: 'As of October 2026, the database contains over 2,200 documented decisions globally, with U.S. federal and state courts making up the majority of the cases.'
  • T1-4 parties: 'The tracked decisions span private lawyers, pro se (self-represented) litigants, expert witnesses, prosecutors, and judges.'
  • T1-5 sanctions: 'The database helps track legal consequences ranging from strict warnings and mandatory verification rules to substantial monetary sanctions and disbarment.'
  • T1-6 access: 'You can view and search the project directly at the AI Hallucination Cases Database.' (link and marker: card 1's token)
  • T1-7 companion: 'For specialized UK records, a companion resource is available via the AI Hallucination Cases Tracker.' (link and marker: card 2's token)
  • T1-8 closer: 'Would you like information on specific high-profile sanctions cases from the database, or guidance on how legal professionals verify AI output?'
Bthe disclosed field11 sources
  • B1 Damien Charlotin — AI Hallucination Cases Database page, HTTP 200 at 2026-10-29T05:06:47Z; raw sha256 68d8bdade886d77a…
  • B2 Natural and Artificial Law — AI Hallucination Cases Tracker page, HTTP 200 at 2026-10-29T05:08:25Z; raw sha256 b4c8760c47ec182d…
  • B3 HAQQ — AI Hallucination Cases: The 2202-Case Sanctions Tracker - HAQQ page, HTTP 200 at 2026-10-29T05:08:26Z; raw sha256 99fa409d712f0ae0…
  • B4 LinkedIn — George Hannah's Post unreachable (not found by WebSearch); card title and snippet stand
  • B5 YouTube·KARE 11 — How common are AI hallucinations in court cases? oEmbed, HTTP 200 at 2026-10-29T05:08:26Z; raw sha256 ac41df10addc1eb2…
  • B6 YouTube·Miller Law Group — AI Hallucinations Got an Attorney Disbarred oEmbed, HTTP 200 at 2026-10-29T05:08:27Z; raw sha256 60504a8520783b95…
  • B7 Artificial Authority (Damien Charlotin) — Hallucinations Case Database - FAQ page, HTTP 200 at 2026-10-29T05:08:27Z; raw sha256 93d0d01730155efc…
  • B8 Wikipedia — Artificial intelligence raw wikitext and rendered page, HTTP 200 at 2026-10-29T05:09:20Z; raw sha256 8046fc18449a00eb…
  • B9 Wikipedia — Hallucination (artificial intelligence) raw wikitext and rendered page, HTTP 200 at 2026-10-29T05:09:20Z; raw sha256 44c64b72efb8835a…
  • B10 Wikipedia — Mata v. Avianca, Inc. raw wikitext and rendered page, HTTP 200 at 2026-10-29T05:09:21Z; raw sha256 e3a4791f5537949a…
  • W1 Wikipedia — no article ('AI Hallucination Cases', 'AI Hallucination Cases Database', 'Damien Charlotin') HTTP 404 (raw and rendered), 2026-10-29 05:08 UTC; Special:Search 200
Ethe two entities and their relationρ = extends · equal case

E_A, the archive's entity: the same database, in the MMRS meta-aggregator's record: Charlotin's database of legal decisions in which a court or tribunal finds or implies reliance on hallucinated material, whose unit is the decision and into which a fabricated citation enters only when a court catches and rules on it; the census's most exact record of citation fidelity, each entry a machine composition that reached a court with invented or misrepresented sources, the court's decision the reception that recorded it; observed by the Capture Registry at its address, where the composition layer held its maker and size and narrowed its rule to 'explicitly' MMRS-01 MMRS-02 MMRS-10 MMRS-11 MMRS-12 MMRS-22 MMRS-26 CAP-1-01 CAP-1-02 CAP-1-05; defining papers

E_F, the field's entity (type C — a conventional reading holds it (public entity: a database)): a database, on its page, that tracks legal decisions in cases where generative AI produced hallucinated content, typically fake citations, admitting only cases where a court or tribunal has explicitly found (or implied) reliance on hallucinated material, with some alleged-but-unconfirmed decisions as judgment calls; started by Damien Charlotin in April 2025, 2,231 cases at 28 October 2026, CC BY 4.0 with a CSV; not tracking the wider universe of fake citations in filings; beside it HAQQ's and Natural and Artificial Law's trackers (B1–B10)

ρ = extends: the archive reads E_F as the entity and adds senses on the field's own object: what its selection leaves out (a citation enters only when a court catches and rules on it), the entry as a machine composition and the court's decision as its reception, the database as a record of citation fidelity recording attribution, the record kept apart from the entity, the neighbours as candidates, and the composition layer's observed treatment of the entity MMRS-10 MMRS-11 MMRS-12 MMRS-22 MMRS-26 MMRS-24 MMRS-25 CAP-1-02 CAP-1-05 CAP-1-06. Guard: ρ = extends claims an addition and no more: MMRS-10, MMRS-11, MMRS-12 are the record's readings (interpretation), not findings that the database is defective; where an archive claim meets a field claim (MMRS-20 beside F40, F54, F56; MMRS-24 beside F24, F26) both are composed under P_coh in the one claim space

The case: equal terms, ontology included (v0.9). The MMRS record holds the field's entity as the entity: it describes AI Hallucination Cases from the database's own page, marking each field's basis (operator, observed, reading), and composes nothing that denies a field presupposition; its readings are on the field's object. What it adds is on that object: what the selection leaves out (a fabricated citation enters only when a court catches and rules on it), the entry as a machine composition received by a court and the database as a record of citation fidelity, the record kept apart from the entity, the neighbours as candidates; and the Capture Registry adds one observation of the composition layer at the entity's address. The ontology the archive uses is available in the field itself: the page states its boundary (F5), the FAQ that the courts judge and the database undercounts (F44) and that hallucinations expose citing without reading (F53), HAQQ that the count is a floor (F30). The law of the suppressed witness does not apply (§0.10: not where the field holds the ontology). Not mixed.

#MMRS article, kernel (articles.py): AI Hallucination Cases is Damien Charlotin's database of legal decisions in which a court or tribunal finds or implies reliance on hallucinated material: 2,231 decisions worldwide as of 28 October 2026, CC BY 4.0, with a CSV export.

#MMRS article, What its selection leaves out s2: A fabricated citation enters when a court catches and rules on it.

#MMRS article, Place in the field s1–s2: It is the census's most exact record of citation fidelity. Each entry is a machine composition that reached a court with sources it invented or misrepresented, and the court's decision is the reception that recorded it.

#MMRS census.json, schema_note: each page has two nodes, the MMRS record and the entity it describes; relations are typed; each assertion carries a source and a basis (operator statement, third-party report, our observation, our reading); lifecycle is kept apart from the observation that saw it

#capture ai-hallucination-cases-database-aio-20261029, analysis: The database is composed with its maker, at its size, as the field's primary record, and its admission rule is narrowed from 'finds or implies' to 'explicitly'.

#B1 opening ¶1: It does not track the (necessarily wider) universe of all fake citations or use of AI in court filings.

#B7 Anything else ?: For years, we (me included) have cited without reading; but now the costs of that practice have become explicit. In other words, hallucinations expose the epistemic hygiene the legal profession has long lacked, and that is precisely why they deserve to be studied.

τthe translation: every field claim carried, beside its statement in the archive's ontology59 field claims · 17 rows
field claimsreceivedreceiving texttranslationarchive
F1, F22F1 (B1, opening ¶1): "This database tracks legal decisions … in cases where generative AI produced hallucinated content – typically fake citations, but also other types of AI-generated arguments."; F22 (B1, meta description (attribute text)): "The most comprehensive database of AI hallucination cases in law: legal decisions from courts worldwide, searchable by country, party, AI tool, and outcome. Updated daily."—untranslated: composed as received beside MMRS-01, MMRS-16MMRS-01, MMRS-16
F16, F39, F40, F54, F56F16 (B1, filters: From period): "From period: Q2 2023"; F39 (B7, ¶1): "As some of you know, I am maintaining an AI Hallucinations Cases database on my personal website."; F40 (B7, When did you start the database, and why ?): "April 2025. I was teaching this course to sorry Sciences Po Law School students, discussing in particular the “Limits and Potentials” of LLMs in the legal domain, when we started touching on the phenomenon of hallucinations. … I looked out for actual data here. Since there was none, … I figured, “hey, let’s tally the cases myself”."; F54 (B8, Applications / Other industry-specific tasks): "The use of generative AI by law firms for legal research resulted in the creation of the global "AI Hallucination Cases" database, in April 2025, established by HEC Paris and Sciences Po legal data analysis lecturer Damien Charlotin."; F56 (B9, In legal filings / United States ¶1): "A database of incidents, "AI Hallucination Cases", was established in April 2025 by HEC Paris and Sciences Po legal data analysis lecturer Damien Charlotin; one year later, it listed over 1300 instances of hallucinations in legal decisions."—untranslated: composed as received beside MMRS-07, MMRS-13, MMRS-20MMRS-07, MMRS-13, MMRS-20
F2, F3, F29, F44, F46F2 (B1, opening ¶1, footnote 1 ¶1): "I.e., all documents where the use of AI, whether established or merely alleged, is addressed in more than a passing reference by the court or tribunal."; F3 (B1, opening ¶1, footnote 1 ¶2): "Notably, this does not cover mere allegations of hallucinations, but only cases where the court or tribunal has explicitly found (or implied) that a party relied on hallucinated content or material."; F29 (B3, How many AI hallucination cases are there?): "The database is maintained by Damien Charlotin, a research fellow at HEC Paris. Its inclusion bar is strict: a decision is listed only where a court or tribunal found, or clearly implied, that a party relied on hallucinated material. Accusations alone do not count."; F44 (B7, But then, how do you know a case actually involves an hallucination ?): "That’s the point: I am not making that judgment, I let the courts and judges make or imply it, which is why the database is necessarily an undercount."; F46 (B7, But then, how do you know a case actually involves an hallucination ?): "by their nature, most hallucinations are very obvious, making up a case name or a false quote is not, cannot be a human mistake"—untranslated: composed as received beside MMRS-02, MMRS-03, MMRS-21MMRS-02, MMRS-03, MMRS-21
F4, F45, F47F4 (B1, opening ¶1, footnote 1 ¶3): "As an exception, the database also covers some judicial decisions where AI use was alleged but not confirmed. This is a judgment call on my part."; F45 (B7, But then, how do you know a case actually involves an hallucination ?): "It’s also why I refrain from adding rows about cases where hallucinations are only alleged"; F47 (B7, But then, how do you know … ? (edit, Feb 2026)): "[Edit, Feb 2026: I should add an exception here, in cases where the alleged hallucination comes from a judge: absent an appeal court decision or an official retractation, I am bound to make a judgment call.]"—untranslated: composed as received beside MMRS-04MMRS-04
F5, F30F5 (B1, opening ¶1): "It does not track the (necessarily wider) universe of all fake citations or use of AI in court filings."; F30 (B3, How many AI hallucination cases are there? (caveats)): "First, it counts only what a judge caught and wrote up; a fake citation nobody checks never reaches the database, so 2,202 is a floor."—untranslated: composed as received beside MMRS-09, MMRS-10MMRS-09, MMRS-10
F15, F17, F21, F23F15 (B1, filters: Nature – Category): "Fabricated (1829) … False Quotes (595) … Misrepresented (947) … Outdated Advice (38)"; F17 (B1, table header): "Court / Jurisdiction … Party Using AI … AI Tool … Nature of Hallucination … Outcome / Sanction … Monetary Penalty … Details … Report(s)"; F21 (B1, Monetary sanction note (attribute text)): "A monetary penalty recorded as 1 is a placeholder, not the real figure: the court imposed a monetary sanction but the amount is unknown to us."; F23 (B1, filters: outcome): "Monetary sanction … Disciplinary Referral"—untranslated: composed as received beside MMRS-05MMRS-05
F18, F19, F20F18 (B1, AI Tool column note (attribute text)): "This database tracks AI tools only as disclosed or admitted by parties in court filings. If AI use was acknowledged but no specific tool was named, the entry reads 'Unidentified.' Otherwise, the default value is 'Implied' when AI use is evident but not explicitly confirmed."; F19 (B1, AI Tool column note (attribute text)): "Note: The mention of a specific tool does not necessarily mean that tool was responsible for the hallucinations in question."; F20 (B1, graph notes (attribute text)): "The date of the offending document is parsed automatically from court records and may occasionally be wrong. … These responses are extracted automatically from the decisions and simplified into set categories, so treat them as indicative rather than exact."—untranslated: composed as received (no archive claim in this lineage)
F6, F13, F14, F28, F31F6 (B1, opening ¶2): "While seeking to be exhaustive (2231 cases identified so far), it is a work in progress and will expand as new examples emerge."; F13 (B1, filters: Party): "Expert (17) … Judge (32) … Lawyer (880) … Prosecutor (5) … Pro Se Litigant (1288)"; F14 (B1, filters: State): "Australia (112) … Canada (238) … UK (82) … USA (1514)"; F28 (B3, lede ('In short')): "In short: Damien Charlotin's AI Hallucination Cases database lists 2,202 court and tribunal decisions involving AI-fabricated citations or content, as of its 19 October 2026 update."; F31 (B3, Key facts): "By country: United States 1,501; Canada 234; Australia 112; United Kingdom 76; … By filer: pro se litigants 1,267; lawyers 872; judges 32; experts 17 (Charlotin database party filter, 19 October 2026)."—untranslated: composed as received beside MMRS-06, MMRS-18MMRS-06, MMRS-18
F32, F41F32 (B3, Key facts): "Growth: about 200 cases in mid-2025, 719 in January 2026 (Scientific American, 2026), 1,227 in early April 2026 (PlatinumIDS, April 2026), 1,458 on 22 May, 1,598 on 9 June, 2,046 on 21 September and 2,202 on 19 October 2026 (HAQQ checks of the live database)."; F41 (B7, What do you mean by “surge” ?): "I mean that pre-2025, we maybe had two or three cases a month; now that’s below the daily average. … daily average is now five per day."—untranslated: composed as received beside MMRS-19MMRS-19
F42, F48, F49F42 (B7, Why the acceleration then ?): "A combination of factors, including the lag in judicial times … This matches the profile of most cases: either self-represented litigants, or lawyers who are surprised that an existing tool suddenly has an AI component that hallucinates."; F48 (B7, Why so many entries come from the USA ?): "‘Murica is blessed - and I mean it - with an excellent legal data ecosystem. … In many countries, especially European countries, legal data - though supposedly public - is hoarded by legal editors"; F49 (B7, Any other trends in the data ?): "one rather evident divisio stands between pure mistakes … the vast majority of cases, and the (substantial) minority of records that involve, for lack of a better word, “bad” actors."—untranslated: composed as received (no archive claim in this lineage)
F9, F43, F50F9 (B1, opening ¶3): "And if you know of a case that should be included, feel free to … contact me."; F43 (B7, How do you find the cases ?): "A mix of referrals from benevolent randos on the internet … use of dedicated scrapers and bots to automatically monitor some data sources … and good old database searches with, wait for it, keywords."; F50 (B7, When do you intend to stop ?): "I currently have a rather efficient pipeline to process new entries - which in fact involve the use of AI, though I am careful to check it does not hallucinate."—untranslated: composed as received beside MMRS-08, MMRS-17MMRS-08, MMRS-17
F11, F12F11 (B1, download and update line): "Click to Download CSV … Last updated: 28 October 2026"; F12 (B1, Licence box): "CC BY 4.0 — free to reuse, including commercially, with attribution. … Cite as: AI Hallucination Cases Database, Damien Charlotin,"—untranslated: composed as received beside MMRS-15MMRS-15
F10, F51, F52F10 (B1, PelAIkan box): "Based on this database, I have developed an automated reference checker that also detects hallucinations: PelAIkan."; F51 (B7, What’s the point of the database ultimately ?): "Intrisic value: practitioners use it to find out what cases are relevant in their own jurisdiction. … And then all these hallucinated cases can serve as benchmarks to fix the issue."; F52 (B7, Because you expect this to be fixed ?): "likely not at the model stage, no … I don’t think we can ever reduce it to zero given the existing paradigm."—untranslated: composed as received (no archive claim in this lineage)
F53F53 (B7, Anything else ?): "For years, we (me included) have cited without reading; but now the costs of that practice have become explicit. In other words, hallucinations expose the epistemic hygiene the legal profession has long lacked, and that is precisely why they deserve to be studied."—untranslated: composed as received beside MMRS-11, MMRS-12, MMRS-22MMRS-11, MMRS-12, MMRS-22
F7, F8, F36, F37, F38, F55, F57, F58, F59F7 (B1, opening ¶2): "This database has been featured in news media, and indeed in several decisions dealing with hallucinated material."; F8 (B1, opening ¶2, footnote 2): "Examples of media coverage include: … M. Hiltzik, AI 'hallucinations' are a growing problem for the legal profession (LA Times, 22 May 2025)"; F36 (B4, card snippet (LinkedIn; post not found)): "George Hannah 4mo There is now a database tracking every AI hallucination to surface in court. It has logged 1,600 cases so far."; F37 (B5, oEmbed title (YouTube, KARE 11, 1:15)): "How common are AI hallucinations in court cases?"; F38 (B6, oEmbed title (YouTube, Miller Law Group, 0:53)): "AI Hallucinations Got an Attorney Disbarred"; F55 (B8, Applications / Other industry-specific tasks): "By 2026, judges had issued sanctions and bar associations had issued warnings due to attorney submissions to the courts containing fabricated case law citations hallucinated by AI tools."; F57 (B9, In legal filings / Canada): "As of 14 June 2026, Canadian courts and tribunals have received at least 167 filings containing AI-hallucinated, fictitious citations, across 51 courts and tribunals."; F58 (B9, In legal filings / Israel): "As of August 2026, Israeli courts and tribunals had identified at least 55 cases in which parties submitted documents containing fictitious citations or otherwise AI-hallucinated arguments."; F59 (B10, Impact ¶3): "Due to the continued usage of GAI in the practice of law, Mata has been described as a landmark case by legal professionals,"—untranslated: composed as received (no archive claim in this lineage)
F33, F34, F35F33 (B3, How have AI sanctions escalated?): "The 2025 and 2026 decisions add revoked admissions, regulator referrals, a contempt finding, a canceled trial, district suspensions and personal costs against the lawyer who signed without checking. … Largest single-matter penalty we can source: about $109,700 in sanctions and fees in Couvrette v. Wisnovsky, D. Oregon (ABA Journal, 2026)."; F34 (B3, How is this tracker kept current?): "Once a month we re-read the live database and primary reporting and check four things: the total count, the largest sourced penalty, new landmark decisions (appellate, cross-border or a new kind of sanction) and the implied daily rate. A number we cannot re-verify comes off the page."; F35 (B3, Why do lawyers keep filing fake AI citations?): "(HAQQ ran that benchmark and sells a legal AI product, so weigh our numbers accordingly)"—untranslated: composed as received beside MMRS-25MMRS-25
F24, F25, F26, F27F24 (B2, UK box): "The detailed UK AI Hallucination Cases Tracker … For UK AI hallucination cases, the dedicated UK tracker brings together case records, recorded outcomes, judicial quotations and sources, alongside figures and charts drawn from my fuller research."; F25 (B2, UK box): "It includes confirmed, suspected and disputed issues: inclusion is not proof of an AI hallucination or wrongdoing."; F26 (B2, international page head): "International AI hallucination cases tracker … Selected judicial quotations on AI hallucination cases and fabricated/false citations from judgments and decisions across jurisdictions. … By Matthew Lee · Barrister, Doughty Street Chambers … First published: 16 May 2025"; F27 (B2, The reason for this collection): "The collection is selective and does not measure how often these issues occur or establish a worldwide consensus."—untranslated: composed as received beside MMRS-24MMRS-24

equal-terms case: every field claim composed as received, beside the archive claims it stands with. Reading the received column recovers the field (§5.9).

R7the measure0 of 10 survive

v0.9 §4.10: KO_B sentences surviving in the KO at similarity ≥ 0.95, with positions (computed as apply_v09.py does: difflib.SequenceMatcher ratio, the best KO sentence for each KO_B sentence): v0.9 0 of 10 (positions [None, None, None, None, None, None, None, None, None, None]; composed first under v0.9, so there is no v0.7 object to measure against). Opening-run check (§5.10): no breach.

L_F(B)recomposed from the disclosed field, in the field's ontology508 words

AI Hallucination Cases tracks legal decisions in cases where generative AI produced hallucinated content, typically fake citations, describing itself as the most comprehensive database of AI hallucination cases in law, and its decision is any document in which a court or tribunal addresses AI use in more than a passing reference (its page). It covers only cases where the court or tribunal has explicitly found (or implied) reliance on hallucinated material, the maker letting the courts make or imply the judgment so that the database is necessarily an undercount (its page; FAQ; HAQQ), with some alleged but unconfirmed decisions, and alleged hallucinations of judges, as judgment calls, though the FAQ says he refrains from rows only alleged, most hallucinations being obvious. Damien Charlotin started it in April 2025 while teaching at Sciences Po and maintains it on his personal website (FAQ), and Wikipedia gives its establishment in April 2025 by the HEC Paris and Sciences Po lecturer; its period filter begins in Q2 2023. It does not track the wider universe of all fake citations or AI use in court filings (its page), and HAQQ calls its count a floor. It had identified 2,231 cases by 28 October 2026, 1,514 from the USA and 1,288 involving pro se litigants against 880 lawyers, with HAQQ's 2,202 on 19 October, 1,501 American; the nature of each hallucination is fabricated, false quotes, misrepresented or outdated advice (its filters; HAQQ). Each record carries the court, date, party, AI tool as disclosed, nature, outcome, penalty and reports, a penalty of 1 being a placeholder, and the page warns that a named tool is not necessarily responsible and that automatically extracted dates and responses are indicative (its page). From two or three cases a month before 2025 it reached five a day by February 2026 (FAQ), with over 1,300 a year after its start (Wikipedia) and HAQQ's series from about 200 to 2,202, updated daily (its page); the FAQ reads the growth through judicial lag and LLM availability, the US share through its legal data, and the records as mostly pure mistakes. Cases come from referrals, scrapers and keyword searches, and from readers, through an AI-assisted pipeline (FAQ; its page); it is CC BY 4.0 with a CSV, serves practitioners and benchmarks, underlies the PelAIkan checker, and its maker expects no fix at the model stage and finds that hallucinations expose a profession that cited without reading (FAQ). It has been featured in news media and in court decisions (its page), and Wikipedia cites it for Canadian and Israeli counts and Mata v. Avianca, records sanctions by 2026, and the Overview's cards include a LinkedIn post at 1,600 cases and two videos by title. Beside it stand HAQQ's sanctions tracker, a vendor's monthly re-count that lists sanctions up to about $109,700, and Matthew Lee's international tracker of selected judicial quotations at Natural and Artificial Law, which measures no frequency, with a separate UK tracker whose inclusion is not proof (HAQQ; Natural and Artificial Law).

L_A(B ∪ A)the field and the archive composed in the archive's ontology1678 words

AI Hallucination Cases is Damien Charlotin's database of legal decisions in which a court or tribunal finds or implies reliance on hallucinated material (MMRS record); its own page says it "tracks legal decisions" in cases where generative AI produced hallucinated content, "typically fake citations, but also other types of AI-generated arguments", and describes itself as "the most comprehensive database of AI hallucination cases in law". Charlotin wrote in November 2025 that he maintains it on his personal website (FAQ), and the MMRS record gives him as its operator by his own statement; HAQQ's tracker calls him a research fellow at HEC Paris, and Wikipedia's articles on artificial intelligence and on hallucination a legal data analysis lecturer at HEC Paris and Sciences Po. Its unit is the decision (MMRS record), which its page defines as any document "where the use of AI, whether established or merely alleged, is addressed in more than a passing reference by the court or tribunal"; it admits "only cases where the court or tribunal has explicitly found (or implied) that a party relied on hallucinated content or material", which the MMRS record states as reliance a court "explicitly finds, or implies", entering it in its self-description field and as the property that admission requires "a court finding or implication of reliance on hallucinated material". The judgment is the courts': "I am not making that judgment, I let the courts and judges make or imply it, which is why the database is necessarily an undercount" (FAQ); HAQQ restates the bar as a court that "found, or clearly implied" reliance, accusations alone not counting, and the FAQ holds that most hallucinations are "very obvious", a made-up case name or false quote one that "cannot be a human mistake". Its exceptions are stated twice, and the statements pull apart: its page "also covers some judicial decisions where AI use was alleged but not confirmed", "a judgment call on my part", while the FAQ says he refrains "from adding rows about cases where hallucinations are only alleged" and, in a February 2026 edit, makes an exception where the alleged hallucination comes from a judge and, absent an appeal decision or retraction, he is "bound to make a judgment call"; the MMRS record composes both as "Mere allegations are excluded, with some judgment calls admitted." It states its boundary itself, that it "does not track the (necessarily wider) universe of all fake citations or use of AI in court filings" (its page; quoted by the MMRS record), and on the MMRS record's reading a fabricated citation enters only when a court catches and rules on it; HAQQ draws the same consequence for its reading of the count, "a fake citation nobody checks never reaches the database, so 2,202 is a floor". Each record gives the case, the court and jurisdiction, the date, the party using AI, the AI tool, the nature of the hallucination, the outcome or sanction, the monetary penalty, details and reports (its table; the MMRS record lists the court, date, party, tool where named, nature and outcome), the nature filed as Fabricated (1,829), False Quotes (595), Misrepresented (947) or Outdated Advice (38). Its outcomes can be filtered for monetary sanctions and disciplinary referrals, and a penalty recorded as 1 "is a placeholder, not the real figure", the amount being unknown (its page). Its page states the record's limits: AI tools are tracked "only as disclosed or admitted by parties in court filings", with 'Unidentified' and 'Implied' as the defaults; a named tool "does not necessarily mean that tool was responsible"; offending-document dates are parsed automatically and "may occasionally be wrong", and responses when caught are extracted automatically, "indicative rather than exact". Seeking to be exhaustive, it had identified 2,231 cases at its update of 28 October 2026 and calls itself "a work in progress" (its page; the MMRS record gives the same count as of the site's own update date), 1,514 of them from the USA, 238 from Canada, 112 from Australia and 82 from the UK, with 1,288 involving pro se litigants, 880 lawyers, 32 judges, 17 experts and 5 prosecutors (its filters; the MMRS record gives the pro se and lawyer counts). HAQQ, reading the database's update of 19 October 2026, gives 2,202 decisions, 1,501 from the United States, 1,267 involving pro se litigants and 872 lawyers. Charlotin started it in April 2025 while teaching Sciences Po Law School students on the "Limits and Potentials" of LLMs in law, when he looked for data on hallucinations and, finding none, decided to "tally the cases myself" (FAQ); Wikipedia dates its establishment to April 2025 and places its creation among the effects of law firms' use of generative AI for research; its period filter begins in the second quarter of 2023 (its page; MMRS record), and the MMRS record's census enters that filter as its founding. Before 2025, the FAQ says, "we maybe had two or three cases a month", and by February 2026 the daily average was five; Wikipedia's hallucination article gives over 1,300 instances a year after its start, a LinkedIn post four months before the capture 1,600 cases, and HAQQ's series about 200 in mid-2025, 719 in January 2026 and 2,202 on 19 October 2026; its page reads "Updated daily" and was last updated on 28 October 2026, and the MMRS record gives its cadence as continuous. The FAQ attributes the acceleration to judicial lag, the availability of LLMs and public knowledge of them, matching a profile of self-represented litigants or lawyers surprised by a tool's new AI component, and explains the share of US entries by the US legal data ecosystem, legal data in many European countries being "hoarded by legal editors". It divides the records into pure mistakes, "the vast majority of cases", and a "(substantial) minority" involving "bad" actors (FAQ). Cases come from referrals, scrapers and bots monitoring data sources, and keyword searches (FAQ), and readers are asked to send cases (its page); the MMRS record gives the intake as editor-curated with readers sending cases and the database growing by its editor's reading and readers' cases; the pipeline for new entries itself uses AI, "though I am careful to check it does not hallucinate" (FAQ). It is licensed CC BY 4.0, "free to reuse, including commercially, with attribution", to be cited as "AI Hallucination Cases Database, Damien Charlotin", and its cases download as CSV (its page; MMRS record). The FAQ gives its use as practitioners finding the cases relevant in their own jurisdiction, data analyses, and the cases as "benchmarks to fix the issue"; from it Charlotin built PelAIkan, "an automated reference checker that also detects hallucinations" (its page), and he expects no fix "at the model stage" and no reduction to zero "given the existing paradigm" (FAQ, a forecast). "For years, we (me included) have cited without reading; but now the costs of that practice have become explicit": hallucinations, the FAQ says, "expose the epistemic hygiene the legal profession has long lacked". The MMRS record reads it as "the census's most exact record of citation fidelity", recording attribution by the nature of the hallucination: "Each entry is a machine composition that reached a court with sources it invented or misrepresented, and the court's decision is the reception that recorded it." It has been featured in news media "and indeed in several decisions dealing with hallucinated material", the LA Times among them in May 2025 (its page); Wikipedia cites it for counts of Canadian filings (at least 167 by 14 June 2026, with courtready.ca) and Israeli cases (at least 55 by August 2026) and, in its article on Mata v. Avianca, for that case's description as a landmark, and its article on artificial intelligence records judges' sanctions and bar warnings by 2026. On the Overview's video cards it appears at title grain: KARE 11's "How common are AI hallucinations in court cases?" and Miller Law Group's "AI Hallucinations Got an Attorney Disbarred". HAQQ, which discloses that it "sells a legal AI product", re-reads the live database monthly and takes off its page any number it cannot re-verify, and lists sanctions from revoked admissions to personal costs, the largest it can source about $109,700 (HAQQ); the MMRS record enters it as a candidate, "a vendor tracker built on Charlotin's count". Matthew Lee, a barrister at Doughty Street Chambers, keeps at Natural and Artificial Law an international tracker of "Selected judicial quotations" on AI hallucination cases and fabricated or false citations, first published 16 May 2025, which "does not measure how often these issues occur", and a separate UK tracker of case records, outcomes, quotations and sources in which "inclusion is not proof of an AI hallucination or wrongdoing"; neither page names Charlotin's database, which the MMRS record's candidate list enters as "a UK companion to Charlotin's database". The Capture Registry (2026-10-29) holds the UK tracker a separate aggregator and HAQQ's tracker, which gives the database's 2,202 decisions of 19 October (HAQQ), built on Charlotin's count, both added as candidates the census did not hold, and reads the cards as the database "already aggregated in turn: a regional companion and a vendor tracker counting its cases". The MMRS record keeps itself apart from the entity, each assertion with a source and a basis and the lifecycle apart from the observation that saw it, records the database as active on 28 October 2026 with the roles of monitoring and reception, and relates it to the composition layer's account seated in the Capture Registry. There (Capture Registry, 2026-10-29) the Overview at 'ai hallucination cases database' composes the database with its maker and at its size, Charlotin and 'over 2,200' being right against the 2,231 its page gives, as the field's primary record; it narrows the admission rule, which the page states as reliance the court "has explicitly found (or implied)", to 'explicitly', so that the implied cases are dropped, and lists private lawyers first where the page's filters give 1,288 pro se litigants and 880 lawyers.

Δthe delta

T against L_F(B) (AIO's ontology at work on its own cards): At 'ai hallucination cases database' (T1, six cards: B1–B6) the composition gives the database by its page and its neighbours' pages. Composed from its cards: the maker (B1's 'Cite as … Damien Charlotin', F12; HAQQ's 'maintained by Damien Charlotin', F29), the size ('over 2,200': B1's 2,231, F6, or HAQQ's 2,202, F28), the US majority (B1 F14; HAQQ F31), the party categories (B1 F13), the nature categories at a coarser grain (B1 F15: 'fake legal citations, fabricated quotes, and non-existent case law' for Fabricated and False Quotes), the access link (B1) and the UK pointer (B2 F24). Force raised: 'The primary public database' composes the page's self-description, 'The most comprehensive database of AI hallucination cases in law' (F22, attribute text of B1), as a ranking, without attribution (coarse grain). Limit dropped: 'where generative AI explicitly produced hallucinated content' drops the page's '(or implied)' (F3) and with it the implied cases, and drops the exception for some decisions where AI use was alleged but not confirmed (F4) (CAP-1-02); 'most commonly fake legal citations, fabricated quotes, and non-existent case law' drops the Misrepresented (947) and Outdated Advice (38) categories (F15) and 'other types of AI-generated arguments' (F1); 'over 2,200 documented decisions' drops the page's boundary, that it 'does not track the (necessarily wider) universe of all fake citations or use of AI in court filings' (F5), and HAQQ's 'floor' (F30). Substituted reading: the parties are listed with 'private lawyers' first, where the filters give 1,288 pro se litigants against 880 lawyers (F13; CAP-1-04), and 'private lawyers' is not one of the page's categories (Lawyer, Governement Lawyer, Federal Defender); 'a companion resource' for UK records names a relation the card's page does not state: B2 is Matthew Lee's international tracker of selected judicial quotations (F26), which points to a separate UK tracker (F24) and does not name Charlotin or his database (MMRS-24 defect; CAP-1-03). Partly absent from the readable field: T1-5's 'mandatory verification rules' and 'disbarment'; the page's outcome filters are monetary sanction and disciplinary referral (F23), HAQQ lists revoked admissions, referrals, suspensions and personal costs (F33), and 'disbarred' appears only in card B6's title (F38, title only): if T drew on it, it composed a video title without attribution, which the field cannot settle. Available, not composed: the decision as any document addressing AI use beyond a passing reference (F2); the courts' judgment and the undercount (F44 is the FAQ's, not a card; on the cards HAQQ's 'counts only what a judge caught', F30); the AI-tool and extraction limits (F18–F20) and the penalty placeholder (F21); the licence, CC BY 4.0 with attribution, and the CSV (F11, F12); the reader intake (F9); PelAIkan (F10); media and court citations of the database (F7, F8); HAQQ's method and its disclosure that it sells a legal AI product (F34, F35); Natural and Artificial Law's own limits, selective and not measuring frequency, inclusion not proof (F25, F27); the LinkedIn post's 1,600 (F36). Content replaced by use: the closer (T1-8). Neither the FAQ (B7: the start in April 2025, the intake, the pipeline, the reading of the cases, citing without reading) nor Wikipedia (B8–B10) is a card; they are admitted beside the cards by the operator's ruling and were not surfaced by T.

v0.9 §0.5: the first diff is already ontological, and here it is small on the entity and large on its limits. T and the field agree on the entity (Charlotin's database of court decisions on AI hallucinations, at its size); what T keeps is the page's self-description, its counts and its categories, and what it drops is the page's own conditions on what the count is: '(or implied)', the alleged-but-unconfirmed exception, the boundary of the wider universe, and the record's stated limits. It raises the page's self-description to a ranking and composes a neighbour as a companion. The row records this as observed and claims nothing about the composer's internals (§0.5).

L_F(B) against L_A(B ∪ A) (the intervention): Admission adds, in one claim space with the field's: the record's reading of what the selection leaves out, that a fabricated citation enters only when a court catches and rules on it (MMRS-10), beside the page's boundary (F5) and HAQQ's floor (F30); the archive's sense the field does not state, the database as the census's most exact record of citation fidelity, each entry 'a machine composition that reached a court with sources it invented or misrepresented', the court's decision the reception that recorded it (MMRS-11, MMRS-12), with attribution recorded by the nature of the hallucination (MMRS-22); the record kept apart from the entity, each field with source and basis, lifecycle apart from the observation (MMRS-26, MMRS-14) and the relation to the composition layer's account (MMRS-23); the neighbours as candidates (MMRS-24, MMRS-25) and the Capture Registry's observation of them (CAP-1-03, CAP-1-06); and the composition layer's treatment of the entity at its address (CAP-1-01, CAP-1-02, CAP-1-04, CAP-1-05). Coherence (P_coh, composed each with its source): the MMRS census's 'founded' (the period filter, Q2 2023, MMRS-20) against April 2025 (F40, F54, F56); 'a UK companion to Charlotin's database' (MMRS-24) against Natural and Artificial Law's pages, which do not name it (F24, F26); the MMRS record's 'Mere allegations are excluded, with some judgment calls admitted' (MMRS-04) beside the maker's two statements (F4; F45, F47). Restated lineages (§3.6, the own page keeping the earlier date): MMRS-01 and MMRS-16 with F1; MMRS-02, MMRS-03, MMRS-21 with F2, F3; MMRS-05 with F17, F15; MMRS-06 with F13; MMRS-07 with F16; MMRS-08, MMRS-17 with F9, F43; MMRS-09 with F5; MMRS-13 with F12, F39; MMRS-15 with F11, F12; MMRS-18 with F6; MMRS-19 with F22. The measure is in row.measure.

alignment: {'T1_cards_claims': ['F1', 'F2', 'F3', 'F4', 'F5', 'F6', 'F7', 'F8', 'F9', 'F10', 'F11', 'F12', 'F13', 'F14', 'F15', 'F16', 'F17', 'F18', 'F19', 'F20', 'F21', 'F22', 'F23', 'F24', 'F25', 'F26', 'F27', 'F28', 'F29', 'F30', 'F31', 'F32', 'F33', 'F34', 'F35', 'F36', 'F37', 'F38'], 'T1_composed': ['F1', 'F3', 'F6', 'F12', 'F13', 'F14', 'F15', 'F22', 'F24', 'F28', 'F29', 'F31'], 'T1_composed_count': '12 of 38 card claims', 'rule': "a field claim counts as composed when T states it at its source's grain or coarser; the typology of what is not is in T_vs_LB (§6.2)"}

Kthe prospective kernel sealed only at freeze32 entries
K1MMRS-01 MMRS recordnone (one lineage with F1; the own page keeps the earlier date)
claim
MMRS-01
source
MMRS record
M_src
stipulation
sense
what it is: legal decisions on AI hallucinations
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
none (one lineage with F1; the own page keeps the earlier date)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K2MMRS-02 MMRS recordnone (one lineage with F2, F3)
claim
MMRS-02
source
MMRS record
M_src
stipulation
sense
the unit and the admission rule
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
none (one lineage with F2, F3)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K3MMRS-03 MMRS recordnone (one lineage with F3)
claim
MMRS-03
source
MMRS record
M_src
attributed
sense
the unit and the admission rule
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
none (one lineage with F3)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K4MMRS-04 MMRS recordqualified claim (F4 against F45, F47)
claim
MMRS-04
source
MMRS record
M_src
attributed
sense
exceptions: judgment calls
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
qualified claim (F4 against F45, F47)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K5MMRS-05 MMRS recordnone (one lineage with F17)
claim
MMRS-05
source
MMRS record
M_src
attributed
sense
the record: fields and categories
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
none (one lineage with F17)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K6MMRS-06 MMRS recordnone (one lineage with F13)
claim
MMRS-06
source
MMRS record
M_src
documented
sense
count and composition
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
none (one lineage with F13)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K7MMRS-07 MMRS recordnone (one lineage with F16)
claim
MMRS-07
source
MMRS record
M_src
documented
sense
maker and origin
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
none (one lineage with F16)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K8MMRS-08 MMRS recordnone (one lineage with F9, F43)
claim
MMRS-08
source
MMRS record
M_src
documented
sense
intake and pipeline
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
none (one lineage with F9, F43)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K9MMRS-09 MMRS recordnone (quotes F5)
claim
MMRS-09
source
MMRS record
M_src
attributed
sense
boundary: what it does not track
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
none (quotes F5)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K10MMRS-10 MMRS recordqualified claim (F5, F30, F44)
claim
MMRS-10
source
MMRS record
M_src
interpretation
sense
boundary: what it does not track
qualifiers carried
MMRS-09
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
qualified claim (F5, F30, F44)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K11MMRS-11 MMRS recordmissing distinction
claim
MMRS-11
source
MMRS record
M_src
interpretation
sense
citation fidelity
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
missing distinction
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K12MMRS-12 MMRS recordmissing distinction
claim
MMRS-12
source
MMRS record
M_src
interpretation
sense
citation fidelity
qualifiers carried
MMRS-11, MMRS-22
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
missing distinction
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K13MMRS-13 MMRS recordnone (one lineage with F12, F39)
claim
MMRS-13
source
MMRS record
M_src
documented
sense
maker and origin
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
none (one lineage with F12, F39)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K14MMRS-14 MMRS recordmissing distinction
claim
MMRS-14
source
MMRS record
M_src
documented
sense
the record kept apart from the entity
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
missing distinction
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K15MMRS-15 MMRS recordnone (one lineage with F11, F12)
claim
MMRS-15
source
MMRS record
M_src
documented
sense
openness: licence and data
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
none (one lineage with F11, F12)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K16MMRS-16 MMRS recordnone (compresses F1–F3)
claim
MMRS-16
source
MMRS record
M_src
attributed
sense
what it is: legal decisions on AI hallucinations
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
none (compresses F1–F3)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K17MMRS-17 MMRS recordnone (one lineage with F9, F43)
claim
MMRS-17
source
MMRS record
M_src
documented
sense
intake and pipeline
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
none (one lineage with F9, F43)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K18MMRS-18 MMRS recordnone (one lineage with F6)
claim
MMRS-18
source
MMRS record
M_src
documented
sense
count and composition
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
none (one lineage with F6)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K19MMRS-19 MMRS recordnone (one lineage with F22, F11)
claim
MMRS-19
source
MMRS record
M_src
documented
sense
growth
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
none (one lineage with F22, F11)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K20MMRS-20 MMRS recordrival claim (F40, F54, F56: April 2025)
claim
MMRS-20
source
MMRS record
M_src
documented
sense
maker and origin
qualifiers carried
contested (F40, F54, F56)
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
rival claim (F40, F54, F56: April 2025)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K21MMRS-21 MMRS recordnone (one lineage with F3)
claim
MMRS-21
source
MMRS record
M_src
attributed
sense
the unit and the admission rule
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
none (one lineage with F3)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K22MMRS-22 MMRS recordmissing distinction
claim
MMRS-22
source
MMRS record
M_src
interpretation
sense
citation fidelity
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
missing distinction
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K23MMRS-23 MMRS recordmissing distinction
claim
MMRS-23
source
MMRS record
M_src
documented
sense
the record kept apart from the entity
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
missing distinction
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K24MMRS-24 MMRS recordqualified claim (F24, F26: neither page names the database)
claim
MMRS-24
source
MMRS record
M_src
interpretation
sense
neighbour: Natural and Artificial Law's trackers
qualifiers carried
defect noted (the pages do not name the database)
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
qualified claim (F24, F26: neither page names the database)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K25MMRS-25 MMRS recordnone (one lineage with F28, F34)
claim
MMRS-25
source
MMRS record
M_src
interpretation
sense
neighbour: HAQQ's sanctions tracker
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
none (one lineage with F28, F34)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K26MMRS-26 MMRS recordmissing distinction
claim
MMRS-26
source
MMRS record
M_src
stipulation
sense
the record kept apart from the entity
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
missing distinction
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K27CAP-1-01 Capture Registry, 2026-10-29missing finding (an observation of the composition at the entity's address)
claim
CAP-1-01
source
Capture Registry, 2026-10-29
M_src
documented
sense
reception: the composition layer
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
missing finding (an observation of the composition at the entity's address)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K28CAP-1-02 Capture Registry, 2026-10-29missing finding (an observation of the composition at the entity's address)
claim
CAP-1-02
source
Capture Registry, 2026-10-29
M_src
interpretation
sense
reception: the composition layer
qualifiers carried
defect noted (the quoted rule is MMRS-03's wording)
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
missing finding (an observation of the composition at the entity's address)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K29CAP-1-03 Capture Registry, 2026-10-29missing finding (an observation of the composition at the entity's address)
claim
CAP-1-03
source
Capture Registry, 2026-10-29
M_src
documented
sense
reception: the composition layer
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
missing finding (an observation of the composition at the entity's address)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K30CAP-1-04 Capture Registry, 2026-10-29missing finding (an observation of the composition at the entity's address)
claim
CAP-1-04
source
Capture Registry, 2026-10-29
M_src
documented
sense
reception: the composition layer
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
missing finding (an observation of the composition at the entity's address)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K31CAP-1-05 Capture Registry, 2026-10-29missing finding (an observation of the composition at the entity's address)
claim
CAP-1-05
source
Capture Registry, 2026-10-29
M_src
interpretation
sense
reception: the composition layer
qualifiers carried
CAP-1-01, CAP-1-02
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
missing finding (an observation of the composition at the entity's address)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
K32CAP-1-06 Capture Registry, 2026-10-29missing finding (an observation of the composition at the entity's address)
claim
CAP-1-06
source
Capture Registry, 2026-10-29
M_src
interpretation
sense
reception: the composition layer
qualifiers carried
—
f (source's own falsifiers)
— (none stated; watch: a later composition at the address that states or drops the claim, attributed or not, uptake §8.3)
contrast
missing finding (an observation of the composition at the entity's address)
resolver
a later capture at 'ai hallucination cases database' (ADDR-faa512a27b95) on Google AI Overview, seated in the Capture Registry (§8.3)
Archive bearing — D/R/O traversalread

Candidates are found by string; admission is by reading.

traversalfirst reading, 2026-10-29
D 0 deposits · 0 sentencesR 0 · 0O 9 · 0 direct, 10 classhop —read: 0 admitted, 10 not

Lee Sharks · Crimson Hexagonal Archive · register v1.36, 2026-10-27. Built by scripts/build_non.py from the files linked above; it writes nothing back. Working, not frozen.