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.
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 (497 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 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 if for a demo !

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

State
Party
Nature – Category
Nature – Subcategory

Case Court / Jurisdiction Date ▼ Party Using AI AI Tool Nature of Hallucination Outcome / Sanction Monetary Penalty Details Reports
Kettering Adventist Healthcare v. Sandra Collier, et al. S.D. Ohio (USA) 2 January 2026 Lawyer Implied
Fabricated Case Law (4)
False Quotes Case Law (1)
Misrepresented Case Law (4)
Show Cause Order
Report
Defendant's Motion to Dismiss
Source: Robert Freund
Johnson v. Digital Federal Credit Union N.D. Texas (USA) 30 December 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
Report
Plaintiff's Second Amended Complaint
M.T. Real Estate Investment Inc. v. Servis One, Inc., et al. D. Nevada (USA) 30 December 2025 Lawyer Unidentified
Fabricated Case Law (4), Doctrinal Work (1)
Briefs Struck; Adverse Costs Order; Bar Referral
Ng v. AmGuard Insurance Company, et al. S.D. New York (USA) 29 December 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
Court warned the pro se plaintiff that future filings containing nonexistent citations may result in sanctions (striking filings, filing restrictions, monetary penalties, or dismissal) and instructed parties to disclose and verify any use of generative AI per local rules.
Report
Plaintiff's Memorandum in Opposition
In re S.A., D.H., and B.M., Minors CA Illinois (USA) 29 December 2025 Lawyer Implied
False Quotes Case Law (4)
Warning
Rachel Jones v. Experian Information Solutions, Inc. E.D. Michigan (USA) 29 December 2025 Pro Se Litigant Implied
Misrepresented Case Law (1)
Warning
Cherleatha B. v. Frank Bisignano D. South Carolina (USA) 29 December 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
Warning
Allen v. Amazon N.D. Texas (USA) 23 December 2025 Pro Se Litigant Unidentified
Fabricated Case Law (1)
False Quotes Case Law (1)
Warning

Amazon alleged that Allen's undisclosed use of AI produced non-existent case citations and hallucinated quotations; the court declined to sanction, warned Allen and required future compliance with local AI-disclosure rule.

Matter of: KE System Services, Inc. GAO (USA) 22 December 2025 Pro Se Litigant Implied
Fabricated Case Law (2)
False Quotes Case Law (1)
Smith v. Clarence Smith et al. N.D. New York (USA) 22 December 2025 Pro Se Litigant Implied
Fabricated Case Law (3)
Misrepresented Case Law (2)
Warning
Report
Plaintiff's Objection
Billups v. Louisville Municipal School District N.D. Mississippi (USA) 19 December 2025 Lawyer Grok
Fabricated Case Law (1)
Misrepresented Case Law (3)
Counsel DQ'd; monetary sanction; obligatory audit of all past filings
Report
Plaintiff's Memorandum

The court also identified five other cases in which the same firm or attorney confessed having misused AI. This despite the attorneys attending CLE training

Disability Rights Mississippi v. Palmer Home for Children N.D Mississippi (USA) 19 December 2025 Lawyer Implied
Fabricated Case Law (3)
False Quotes Case Law (5)
Monetary sanction; CLE requirement; notification to bar and other courts; attorney withdrawal. 20883 USD
Report
Plaintiff's Memorandum
Fantini v. WestRock Services, LLC D. New Jersey (USA) 19 December 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
Warning
Report
Plaintiff's Cross Motion for Summary Judgment
Robert Lafayette v. Alex Abrami et al Vermont SC (USA) 18 December 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
False Quotes Case Law (1)
Misrepresented Case Law (1)
Adverse Costs Order; Pre-Filing Injunction 7361 USD

Order to show cause is here.

JPMorgan Chase Bank, N.A. v. Christina Buenzli CA California (USA) 18 December 2025 Pro Se Litigant Implied
Fabricated Case Law (6)
False Quotes Case Law (3)
Gerou v. George, Whitten, and United States E.D. Wisconsin (USA) 18 December 2025 Pro Se Litigant Implied
Fabricated Case Law (3)
False Quotes Case Law (1)
Misrepresented Case Law (3)
Warning
Edward Starski v. Chandler Holderness CA Appeals (USA) 18 December 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
False Quotes Case Law (1)
Warning
Angelica E. Cruz et al. v. United States of America C.D. California (USA) 16 December 2025 Lawyer Implied
Fabricated Case Law (1)
Order to Show Cause
In re Ricardo Andres Romeu CA Texas (USA) 16 December 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
Warning
Taylor v. Prince George’s County, Maryland D. Maryland (USA) 16 December 2025 Lawyer Implied
False Quotes Case Law (1)
Misrepresented Case Law (2)
Report
Plaintiff's Response
Dorsey v. Jones Delaware C. Ch. (USA) 16 December 2025 Lawyer Implied
Fabricated Case Law (1)
False Quotes Case Law (1)
Order to certify future filings re: AI
Liza Gardner v. Sean Combs, et al. D. New Jersey (USA) 15 December 2025 Lawyer Unidentified
Fabricated Case Law (1)
Monetary fine; Bar Referral; Order to serve order to Client 6000 USD

Counsel had already been sanctioned in different case, and professed having gone through CLE on generative AI.

Source: Robert Freund
Sayali Kulkarni & Abhijit Kulkarni v. Merit Systems Protection Board CA Federal Circuit (USA) 15 December 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
False Quotes Case Law (1)
Affirmed the Board; granted motions to strike the Kulkarnis' informal reply briefs containing the false citations/quotes
Report
Plaintiff's Informal Brief
Lexos Media IP, LLC v. Overstock.com, Inc. D. Kansas (USA) 15 December 2025 Lawyer Unidentified
Fabricated Case Law (2)
Misrepresented Case Law (1)
Order to Show Cause
Braica v. Frankowski (Anthony Braica v. Tom Frankowski) D. Connecticut (USA) 15 December 2025 Pro Se Litigant Implied
Fabricated Case Law (2)
False Quotes Case Law (2)
Misrepresented Case Law (7)
Outdated Advice Overturned Case Law (1)
Briefs struck; warning
Johnson / Estate of Fisher v. City of Annapolis D. Maryland (USA) 13 December 2025 Lawyer Implied
Fabricated Case Law (1)
Misrepresented Case Law (1), Exhibits or Submissions (1)
(Attorney was dismissed by its client)
Report
City's Motion
Source: Volokh
Couvrette v. Wisnovsky Oregon (USA) 12 December 2025 Lawyer Unidentified
Fabricated Case Law (1)
False Quotes Case Law (1)
Briefs struck; Monetary sanction; Adverse costs order; claims dismissed with prejudice 15500 USD
Report
Plaintiff's Motion for Partial Judgments

Order to show cause is here.

McLain v. Board of County Commissioners of Sedgwick County, Kansas, et al. D. Kansas (USA) 11 December 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
Misrepresented Case Law (1)
Warning
Report
Plaintiff's Motion
Preston House v. TH Foods, Inc. D. Nevada (USA) 11 December 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
Misrepresented Case Law (1)
Admonishment
Arkansas DHS v. April Ward and Minor Child Respondents SC Arkansas (USA) 11 December 2025 Lawyer Implied
Fabricated Case Law (1)
False Quotes Case Law (1)
Outdated Advice Repealed Law (1)
Show Cause Order
Sean Gottlieb v. Adtalem Global Education N.D. Illinois (USA) 10 December 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
Order to Show Cause
Report
Plaintiff's Second Memorandum
Russell v. Mells CA Florida (USA) 10 December 2025 Lawyer Unidentified
Fabricated Case Law (1)
Misrepresented Case Law (1)
Bar Referral

"Unfortunately, we're finding this problem arising more and more frequently […] When a lawyer cites imaginary legal authorities to our court as if they were law, we are compelled to refer that lawyer to the Bar because of the professional rules of conduct.

It doesn't take much moral imagination to understand why. As judges, we rely on attorneys to ethically represent their clients. We expect that representation to be zealous, honest, and competent. Indeed, lawyers owe the courts and their clients a duty to practice with competence and candor. By signing an appellate brief, a lawyer certifies that he or she has read the document and that to the best of the lawyer's knowledge, information, and belief there are "good grounds to support the document."

These ethical requirements are not excused simply because a computer program generated a faulty or misleading legal analysis. Nor is it an excuse that the attorney did not intend to mislead the court. "To state the obvious, it is a fundamental duty of attorneys to read the legal authorities they cite in appellate briefs or any other court filings to determine that the authorities stand for the propositions for which they are cited."

Obviously, that didn't happen when Ms. McLane filed this answer brief. Instead, counsel "fundamentally abdicated" her duty to the court and her client when she submitted this filing without verifying that the three cases cited in her brief said what she claimed they said. Accordingly, it is our duty to refer this matter to the Florida Bar to proceed as it deems appropriate."

Source: Volokh
James Fahey v. Wally’s Las Vegas, LLC, et al. D. Nevada (USA) 10 December 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
False Quotes Case Law (1)
Misrepresented Case Law (1)
Warning
Report
Plaintiff's Response
South Side Area School District et. al v. Pennsylvania Human Relations Commission, Pennsylvania CC (USA) 10 December 2025 Lawyer Implied
False Quotes Case Law (1)
Misrepresented Case Law (1)

See story here.

Sharky’s Sports Bar, et al. v. Village of Mt. Morris, Illinois, et al. N.D. Illinois (USA) 10 December 2025 Lawyer Implied
Misrepresented Case Law (2)
Warning
Report
Defendants' Motion to dismiss
Christian Dusablon v. Hugh A. Gibbs and Union Logistics, LLC S.D. New York (USA) 9 December 2025 Lawyer Implied
Fabricated Case Law (1)
Warning; Order to Certify validity of future citations
Report
Plaintiff's Memorandum of Law
Scott M. Boger v. City of Harrisonburg, Virginia, et al. W.D. Virginia (USA) 9 December 2025 Pro Se Litigant Implied
False Quotes Case Law (1)
Misrepresented Case Law (1)
Warning
Brian Jeffrey Hall Jr. v. Halsted Financial Services, LLC W.D. Virginia (USA) 8 December 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
Warning
Jodell Dodge v. FirstService Residential Arizona LLC D. Arizona (USA) 8 December 2025 Lawyer Federally Lawyer
Fabricated Case Law (1)
False Quotes Case Law (3)
Misrepresented Case Law (2)
Bar Referral
Report
Plaintiff's Opposition
Thomas Duncan v. Gridhawk et al. W.D. Texas (USA) 6 December 2025 Pro Se Litigant Implied
Fabricated Case Law (2)
False Quotes Case Law (1)
Plaintiff's objections struck
Associated Builders and Contractors v. Bucks County Community College CC Pennsylvania (USA) 5 December 2025 Lawyer Unidentified
Fabricated Case Law (1)
Brief struck and ignored
Donnie Yarn and Deshawn Murphy v. Trader Joe's D. Oregon (USA) 5 December 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
Order to Show Cause
Report
Plaintiff's Opposition
Source: Jesse Schaefer
Shana Jordan, et al. v. Chicago Housing Authority et al. CC Illinois (USA) 5 December 2025 Lawyer ChatGPT
Fabricated Case Law (2)
False Quotes Case Law (1)
Misrepresented Case Law (4)
Motion partly struck; Monetary sanctions 59500 USD

(Motion for sanctions available here.)

"The court’s focus here is not the misuse of artificial intelligence to conduct unreliable legal research and drafting. It is the inexcusable submission of false authority and factual arguments to the court, the subsequent misrepresentations about the extent of the improper conduct, and the failure to take prompt responsibility for errors once discovered. The obligations on officers of the court at issue here precede by centuries the age of electronic research and artificial intelligence.

The failures to meet those obligations do serious damage to the respect for the legal profession, and they merit sanctions. The most serious sanctionable conduct consists of actions taken after the attorneys had time to consider the consequences of submitting false statements of law and facts to the court, and had time to discover and disclose the full extent of the errors in citations and in factual assertions.

[...]

Artificial Intelligence is not the cause of bad legal practice. Lawyers performed their obligations well and performed their obligations poorly before Al, before electronic research platforms, before on-line publication of case law, and before the development of the West Key Number System or Shepard’s indexes.

Submission of false legal citations and demonstrably false factual claims pose a grave threat to the judicial branch. People are skeptical of institutions, and the legal profession is not exempt. We are duty-bound to attend to the integrity the courts so that close scrutiny reveals a model of honesty, accountability, and truth-seeking.

The authority of the courts relies on public confidence that rulings are just and are grounded in the law, not on the whims of judges. “[A] lawyer should further the public’s understanding of and confidence in the rule of law and the justice system because legal institutions in a constitutional democracy depend on popular participation and support to maintain their authority.” (IRPC Preamble, par. 6) Officers of the court cannot become comfortable with careless or deliberate misrepresentation of facts or the law."

In re: Nupeutics Natural, Inc.; Gladstone v. Peatross S.D. California (USA) 5 December 2025 Lawyer Unidentified
Fabricated Case Law (1)
Misrepresented Case Law (1), Legal Norm (2)
Monetary Sanction; CLE; Bar referral 950 USD
Report
Defendant's Memorandum
Mullins v. Duquesne University of the Holy Spirit W.D. Pennsylvania (USA) 5 December 2025 Pro Se Litigant Implied
False Quotes Case Law (3)
Reply struck; Order to disclose AI use
Report
Plaintiff's Reply
Dalton Gage Hill v. Oklahoma County Criminal Justice Authority et al. W.D. Oklahoma (USA) 4 December 2025 Lawyer ChatGPT
Fabricated Case Law (1)
Costs Order; Mandatory disclosure of AI use in future filings; CLE obligation

Underlying report & Recommendations can be found here.

Source: Robert Freund
Black Oak Capital BOCA, LLC v. Paul Evans, LLC, et al. D. Utah (USA) 4 December 2025 Lawyer Implied
Fabricated Case Law (2)
False Quotes Case Law (1)
Order for counsel to read cited authorities and file a certification within 30 days
Jacob Barry Allston v. Ron DeSantis, et al. M.D. Florida (USA) 4 December 2025 Pro Se Litigant Implied
Fabricated Case Law (1)
False Quotes Case Law (2)
Warning
Dorsey v. Ponce, et al. N.D. Illinois (USA) 4 December 2025 Pro Se Litigant Implied
Fabricated Case Law (4)
Warning
Tiffany Regina Ringer v. Bank of America, N.A. N.D. Georgia (Atlanta Division) (USA) 4 December 2025 Lawyer Implied
False Quotes Case Law (1), Legal Norm (1)
Misrepresented Case Law (1)
Fine; Ordered to submit statement of training/oversight 1500 USD

The court found numerous quotation and citation inaccuracies in Defendant's Memorandum. Counsel admitted the errors, denied using AI, and the court concluded the errors were negligent violations of Rule 11. The court recommended sanctions including public identification, a $1,500 payment, and oversight measures; the firm must submit a statement of training/oversight.

Source: Robert Freund