Law firms
Incidents involved as Deployer
Incident 15583 Report
Sullivan & Cromwell Reportedly Filed Emergency Bankruptcy Motion Containing AI-Generated Legal Errors
2026-04-09
Sullivan & Cromwell reportedly filed an emergency motion in the Chapter 15 bankruptcy case of Prince Global Holdings that contained numerous citation and legal inaccuracies. The firm later acknowledged that some errors were AI hallucinations and that its AI-use and citation-review policies had not been followed. After opposing counsel identified the problems, the firm reportedly undertook a formal remedial response.
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State Farm Defense Counsel Acknowledged AI-Assisted Filings in Meni-Siliga v. A's Contractor, Inc. Contained Fabricated Legal Authorities
2026-03-31
In Fa'alagilagi Meni-Siliga v. A's Contractor, Inc., et al., attorneys representing State Farm acknowledged that AI-assisted motions contained fabricated and otherwise inaccurate legal authorities. Attorney Jacquelene Robinson said she used the legal AI tool Irys and failed to verify some citations. Opposing counsel identified the errors, after which the firm apologized and filed corrected versions.
MoreIncident 17283 Report
Law Firm Shapiro Arato Bach Reportedly Filed Fictitious Case Citation and Misattributed Quotations Using Harvey's Legal AI Platform in New York Federal Court
2026-09-22
Law firm Shapiro Arato Bach reportedly acknowledged that unchecked use of Harvey, a legal AI platform, produced a fictitious case citation and misattributed quotations in a brief filed in federal court in New York. The court required an explanation and disclosure of the AI tool. The judge declined sanctions, and the firm apologized and said it was adding safeguards.
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Study Highlights Persistent Hallucinations in Legal AI Systems
2024-05-23
Stanford University’s Human-Centered AI Institute (HAI) conducted a study in which they designed a "pre-registered dataset of over 200 open-ended legal queries" to test AI products by LexisNexis (creator of Lexis+ AI) and Thomson Reuters (creator of Westlaw AI-Assisted Research and Ask Practical Law AI). The researchers found that these legal models hallucinate in 1 out of 6 (or more) benchmarking queries.
MoreRelated Entities
Other entities that are related to the same incident. For example, if the developer of an incident is this entity but the deployer is another entity, they are marked as related entities.
Related Entities
Judicial integrity
Incidents Harmed By
- Incident 16583 Reports
State Farm Defense Counsel Acknowledged AI-Assisted Filings in Meni-Siliga v. A's Contractor, Inc. Contained Fabricated Legal Authorities
- Incident 17283 Reports
Law Firm Shapiro Arato Bach Reportedly Filed Fictitious Case Citation and Misattributed Quotations Using Harvey's Legal AI Platform in New York Federal Court
Epistemic integrity
Incidents Harmed By
- Incident 16583 Reports
State Farm Defense Counsel Acknowledged AI-Assisted Filings in Meni-Siliga v. A's Contractor, Inc. Contained Fabricated Legal Authorities
- Incident 15551 Report
Reportedly AI-Assisted Boies Schiller Brief in Bixler v. Church of Scientology Allegedly Contained Material Citation Errors and a Nonexistent Case
Large language model developers
Incidents involved as Developer
- Incident 17283 Reports
Law Firm Shapiro Arato Bach Reportedly Filed Fictitious Case Citation and Misattributed Quotations Using Harvey's Legal AI Platform in New York Federal Court
- Incident 15711 Report
California Immigration Attorneys Reportedly Sanctioned Over Briefs Containing Probable Hallucinations in LNU v. Blanche
Large language models
Incidents implicated systems
- Incident 17283 Reports
Law Firm Shapiro Arato Bach Reportedly Filed Fictitious Case Citation and Misattributed Quotations Using Harvey's Legal AI Platform in New York Federal Court
- Incident 15711 Report
California Immigration Attorneys Reportedly Sanctioned Over Briefs Containing Probable Hallucinations in LNU v. Blanche