AI Hallucination Cases

This database tracks legal decisions1 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.

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.

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.
in cases where generative AI produced hallucinated content – typically fake citations, but also other types of AI-generated arguments. It does not track the (necessarily wider) universe of all fake citations or use of AI in court filings.

While seeking to be exhaustive (831 cases identified so far), it is a work in progress and will expand as new examples emerge. This database has been featured in news media, and indeed in several decisions dealing with hallucinated material.2 Examples of media coverage include:
- M. Hiltzik, AI 'hallucinations' are a growing problem for the legal profession (LA Times, 22 May 2025)
- E. Volokh, "AI Hallucination Cases," from Courts All Over the World (Volokh Conspiracy, 18 May 2025)
- J-.M. Manach, "Il génère des plaidoiries par IA, et en recense 160 ayant « halluciné » depuis 2023" (Next, 1 July 2025) - J. Koebler & J. Roscoe, "18 Lawyers Caught Using AI Explain Why They Did It (404 Media, 30 September 2025)

If you have any questions about the database, a FAQ is available here.
And if you know of a case that should be included, feel free to contact me.3 (Readers may also be interested in this project regarding AI use in academic papers.)

Based on this database, I have developped an automated reference checker that also detects hallucinations: PelAIkan. Check the Reports Report icon in the database for examples, and reach out to me for a demo !

For weekly takes on cases like these, and what they mean for legal practice, subscribe to Artificial Authority.

Click to Download CSV
Last updated: 5 May 2026
State
Party
Nature – Category
Nature – Subcategory

Case Court / Jurisdiction Date ▼ Party Using AI AI Tool Nature of Hallucination Outcome / Sanction Monetary Penalty Details Report(s)
Ren v. Area 09 BCPAAB (Canada) 7 October 2025 Pro Se Litigant Implied
Fabricated Case Law (2)
Misrepresented Doctrinal Work (1)
Breach of Board's Code of Conduct 910 CAD

(Monetary sanction decided in later determination, available here.)

In the Matter of Stephen C. CBCA (USA) 7 October 2025 Pro Se Litigant Unidentified
Fabricated Legal Norm (1)
Claim denied; reimbursement of moving costs denied.

Claimant cited several inapplicable regulations to support reimbursement. When directed to supply the texts, claimant admitted he had used artificial intelligence to create his submission and withdrew reliance on the cited regulations except for JTR 053710. The Board denied the claim.

Source: David Timm
Delisle v. Canadian Association of Professional Employees FPSLREB (Canada) 3 October 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
Misrepresented Case Law (1)
NewRez LLC v. Morton SC New York (USA) 2 October 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
No sanction
Backhaus v. Area 01 BC Property Assessment Appeal Board (Canada) 2 October 2025 Pro Se Litigant Implied
Fabricated Case Law (2)
Warning

The appellant cited two reported decisions which the Board could not locate and concluded likely do not exist and may have been generated with AI; the Board excluded those authorities from evidence and cautioned the appellant about nondisclosure of AI per the Board's Code of Conduct.

Specter Aviation Limited v. Laprade CS Québec (Canada) 1 October 2025 Pro Se Litigant Unidentified
Fabricated Case Law (1)
Monetary sanction for procedural misconduct 5000 CAD

Monsieur Laprade filed a contestation containing multiple citations to non-existent authorities generated with the assistance of artificial intelligence. The Court found these to be fabricated (so-called "hallucinated") citations, constituting a manquement important to the conduct of the proceeding under art. 342 C.p.c., and imposed a 5,000$ sanction.

Gavin B. Davis v. Chief Officer Gina Faubion, et al. W.D. Texas (USA) 1 October 2025 Pro Se Litigant Unidentified
Misrepresented Case Law (1), Doctrinal Work (1), Legal Norm (1)
Court accepted the R&R, dismissed the action with prejudice under 28 U.S.C. § 1915(e), and denied leave to amend.
Fernando Oliveira v Ryanair DAC Workplace Relations Commission (Ireland) 1 October 2025 Pro Se Litigant Unidentified
Fabricated Case Law (2)
Misrepresented Case Law (7)
Conduct described as abuse of process

The Adjudication Officer found the complainant's submissions contained multiple inaccurate and non‑existent legal citations. The Respondent had flagged AI‑generated drafting and numerous phantom or misquoted determinations; the Officer concluded the complainant failed to establish a prima facie case and that the submissions contained egregious and misleading citations.

Jackson v. United States DHS D. Nevada (USA) 1 October 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
False Quotes Case Law (1)
Misrepresented Case Law (1)
Warning
Hogan v. Treasury Board Federal PSLREB (Canada) 1 October 2025 Pro Se Litigant Implied
Fabricated Case Law (4), Doctrinal Work (1)
False Quotes Legal Norm (1)
Misrepresented Case Law (3)
Outdated Advice Repealed Law (1)
Tomlin v. State of New Mexico D. New Mexico (USA) 30 September 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
Warning
In re the Marriage of D.X. and S.P. CA California (USA) 30 September 2025 Pro Se Litigant Implied
Fabricated Case Law (7)
Warning

The appellate opinion and editor's note identify numerous incorrect or non-existent case citations in the appellant's filings. The court treated those citations as unreliable, found several to be fictitious or unlocatable, and declined to credit them in resolving the appeals.

In re: Todd Elliott Koger W.D. Pennsylvania (Bankruptcy) (USA) 30 September 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
One-year filing bar.

The Court observed that several authorities cited in the Kogers' pro se filings do not exist and appeared to be fabricated (noting possible use of AI), warned of Rule 9011 implications, and treated the filings as part of an abusive litigation strategy warranting dismissal and a one-year filing bar.

Mitchell Taylor Button & Dusty Button v. Juliet Doherty et al. S.D. New York (USA) 30 September 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
False Quotes Case Law (2)
Misrepresented Exhibits or Submissions (1)
Certification requirement for future AI-assisted filings.
Munoz v. Lopez CA California (USA) 29 September 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
Warning
Chapter Kris Jackson v. BOK Financial Corporation, et al. (2) N.D. Oklahoma (USA) 29 September 2025 Pro Se Litigant Implied
Fabricated Case Law (5)
False Quotes Case Law (1)
Show Cause Order
Jade Riley Burch v. HCA Healthcare D. Nevada (USA) 26 September 2025 Pro Se Litigant Unidentified
Fabricated Case Law (1)
Misrepresented Case Law (1)
Warning
Oready, LLC (2) GAO (USA) 25 September 2025 Pro Se Litigant Implied
Fabricated Case Law (4)
Misrepresented Case Law (1)
Protests dismissed for abuse

Actually the fourth order in that case that pertains to hallucinations; a first, June 5 Order is only mentioned in a second, June 18 order that does not call out what appears to be hallucinated references.

Source: David Timm
Evans, et al. v. Robertson et al. (2) E.D. Michigan (USA) 25 September 2025 Pro Se Litigant Implied
Fabricated Case Law (3)
False Quotes Case Law (3)
Warning to both parties
Source: Volokh
Eric Andrew Perez v. Dr. Neil C. Evans, et al. S.D. New York (USA) 25 September 2025 Pro Se Litigant ChatGPT
Fabricated Case Law (1)
Misrepresented Case Law (1)
Warning
Source: Jesse Schaefer
BFG aka Byline Financial v. Pierce RE Holdings & Brewster N.D. Illinois (USA) 24 September 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
Warning
Melinda L'Shay Johnson v. MINI of Las Vegas D. Nevada (USA) 24 September 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
Warning
T.M. v. M.M. CA Indiana (USA) 24 September 2025 Pro Se Litigant Implied
Fabricated Case Law (5)
False Quotes Case Law (1)
Misrepresented Exhibits or Submissions (1), Legal Norm (1)
Warning

The Court preserved the invalid citations in the opinion as they are part of the record, admonished that fabricated or incorrect citations frustrate review and may lead to reprimand or sanction.

Salem v. Deputy Head Federal PSLREB (Canada) 24 September 2025 Pro Se Litigant Implied
Fabricated Case Law (4)
Misrepresented Case Law (1)
Stile Carpentry Ltd. v. 2004424 Ontario CA Ontario (Canada) 23 September 2025 Pro Se Litigant Implied
Fabricated Case Law (1), Exhibits or Submissions (1), Legal Norm (1)
False Quotes Case Law (1)
Misrepresented Case Law (1)
In re Molina E.D. New York (Bankruptcy) (USA) 22 September 2025 Pro Se Litigant Implied
Fabricated Case Law (4)
Order to sworn accuracy of citations
Martin v. Redstone Federal Credit Union N.D Alabama (USA) 19 September 2025 Pro Se Litigant Implied
Fabricated Case Law (8)
Warning
Ali v. IT People Corporation E.D. Michigan (USA) 19 September 2025 Pro Se Litigant Implied
Fabricated Legal Norm (1)
False Quotes Case Law (1)
Misrepresented Legal Norm (1)
Monetary Sanction 600 USD
United States v. Malik D. Maryland (USA) 19 September 2025 Pro Se Litigant Implied
Fabricated Legal Norm (1)
False Quotes Doctrinal Work (1)
Warning
Source: Jesse Schaefer
Cingel v. Ferreri CA Indiana (USA) 19 September 2025 Pro Se Litigant Implied
Fabricated Case Law (2), Legal Norm (3)
Misrepresented Case Law (1), Legal Norm (2)
Warning
Eric V. Mitchel II v. Stellantis Financial Services E.D. Virginia (USA) 18 September 2025 Pro Se Litigant Implied
Fabricated Case Law (3)
Warning

"The Court respectfully proposes that the time may be near for an exception to the Erickson liberal-construction rule, where a pro se individual relies on AI to draft pleadings and thus blurs the line between what is a good faith pro se assertion of an actionable claim and what is a computer-generated morass that only serves to waste court time and resources."

Source: Jesse Schaefer
Hugo v Affinity Education Group Pty Ltd Family Court (Australia) 18 September 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
Warning
Tsupko v. Kinetic Advantage, LLC S.D. Indiana (USA) 17 September 2025 Pro Se Litigant Implied
Fabricated Case Law (2)
Misrepresented other (1)
Admonishment and Warning
Source: Robert Freund
Jeramiah Brown v. Fat Dough Incorp., doing business as Dominos Pizza N.D. New York (USA) 17 September 2025 Pro Se Litigant ChatGPT
Fabricated Case Law (1)
Warning
Latasha Hill v. Auto Club Family Insurance Company S.D. Mississippi (USA) 17 September 2025 Pro Se Litigant Implied
Fabricated Case Law (3)
Misrepresented Case Law (2)
Warning
Source: Jesse Schaefer
Santree v. Eveangel Hines CA North Carolina (USA) 17 September 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
Misrepresented Case Law (1)
Appeal dismissed for lack of genuine argument

Defendant's reply brief contained citations that did not support her arguments and included at least one non-existent case citation; the court concluded these errors suggest use of AI and treated the issues as abandonment under Rule 28(b)(6), dismissing the appeal.

Source: Jesse Schaefer
Howe v. NSW Department of Education NSW Industrial Relations Commission (Australia) 17 September 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
Misrepresented Case Law (2)
BKA Holdings v. Sam CA Illinois (USA) 16 September 2025 Pro Se Litigant Implied
Fabricated Case Law (4)
Plaintiff awarded attorney fees and costs for spotting hallucinated authority 1 USD
Fagan v. Barnhiser, Nanologix, et al. D. New Jersey (USA) 16 September 2025 Pro Se Litigant Implied
Fabricated Case Law (2)
Warning
Ezenwa Ebem v. Bondi et al. N.D. Texas (USA) 15 September 2025 Pro Se Litigant Implied
Fabricated Exhibits or Submissions (1)
Misrepresented Exhibits or Submissions (1)
Warning

The court found the plaintiff's filings contained misrepresentations of the record—specifically, a purported 'Clerk's Entry of Default' that never existed and a claim that an Immigration Judge made a final binding APA finding. The court attributed these misrepresentations to likely AI generation, warned the plaintiff about consequences for false statements, and construed the misrepresentations as AI misapplication rather than deliberate deception.

Nga Huynh v. Joseph Desimone CA California (USA) 15 September 2025 Pro Se Litigant Implied
Fabricated Case Law (2)
Warning

The appellant (self-represented) cited two nonexistent cases in her appellate brief. The respondent flagged the fictitious citations and requested sanctions. The court found the citations fictitious, discussed sanction authority and AI-generated filings, but declined to impose sanctions because the request was procedurally inappropriate, the appellant corrected filings promptly, and the legal propositions were, in fact, supported by existing authority.

Nicholas George DiCristina v. The Department of Employment Security, et al. CA Illinois (USA) 12 September 2025 Pro Se Litigant Implied
Fabricated Case Law (1)

The appellate court observed that the pro se appellant's opening brief cited cases that do not exist and exhibited hallmarks of generation by a large language model (repetitive 'refined' drafts, internal suggestions, and the statement 'Generative AI is experimental'). The court identified the fabricated citations and noted the brief's deficiencies but proceeded to decide the jurisdictional timeliness issue on the merits, affirming dismissal.

Source: Jesse Schaefer
Helmold & Mariya (No 2) Family Court (Australia) 12 September 2025 Pro Se Litigant Unidentified
Fabricated Case Law (1)
Warning

The appellant admitted using generative AI to prepare his Notice of Appeal and Summary of Argument. The Court found several cited authorities could not be located (concluding they were fictitious) and held that deploying unverified AI-generated research that cites non-existent cases breaches duties not to mislead the court and risks contravening Pt XIVB of the Family Law Act 1975 (Cth) (on confidentiality of proceedings).

Mid-America Apartment Communities, Inc. v. Dennis Michael Philipson W.D. Tennessee (USA) 11 September 2025 Pro Se Litigant Unidentified
Fabricated Case Law (1)
Warning
Calvin Bradley v. Matthew Eichhorn, et al. S.D. Ohio (USA) 11 September 2025 Pro Se Litigant Implied
Misrepresented Case Law (2)
Warning
Source: Jesse Schaefer
Régie du bâtiment du Québec c. 9308-2469 Québec inc. Régie du bâtiment du Québec (Canada) 11 September 2025 Pro Se Litigant ChatGPT
Fabricated Case Law (1), Legal Norm (1)
Disregarded AI-generated arguments
Shantell Robinson v. Oglala Sioux Tribe, et al. W.D. Oklahoma (USA) 9 September 2025 Pro Se Litigant Unidentified
Fabricated Case Law (1)
Misrepresented Case Law (1)
Plaintiff's claims dismissed with prejudice
Ariel Mendones, et al. v. Cushman and Wakefield et al SC California (USA) 9 September 2025 Pro Se Litigant Unidentified
Fabricated Exhibits or Submissions (5)
Terminating sanction: second amended complaint struck; entire action dismissed with prejudice.

The court found multiple exhibits (videos, photographs, messaging screenshots, and metadata) to be fabricated or materially altered using generative AI. The court deemed Plaintiffs' explanations not credible, declined criminal referral, declined monetary sanctions, and imposed a terminating sanction under Cal. Civ. Proc. Code § 128.7(b).

Case No. 2024가단144734 D. Incheon (South Korea) 9 September 2025 Pro Se Litigant Implied
Fabricated Case Law (1)

As recounted here.

Poole v. Walmart, Inc. N.D. Illinois (USA) 5 September 2025 Pro Se Litigant Implied
Fabricated Case Law (4)
Outdated Advice Repealed Law (1)
Warning