Law firms
Incidents involved as Deployer
Incidente 15583 Reportes
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.
MásIncidente 16583 Reportes
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.
MásIncidente 17283 Reportes
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.
MásIncidente 7042 Reportes
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.
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Entidades relacionadas
Judicial integrity
Afectado por Incidentes
- Incidente 16583 Report
State Farm Defense Counsel Acknowledged AI-Assisted Filings in Meni-Siliga v. A's Contractor, Inc. Contained Fabricated Legal Authorities
- Incidente 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
Epistemic integrity
Afectado por Incidentes
- Incidente 16583 Report
State Farm Defense Counsel Acknowledged AI-Assisted Filings in Meni-Siliga v. A's Contractor, Inc. Contained Fabricated Legal Authorities
- Incidente 15551 Report
Reportedly AI-Assisted Boies Schiller Brief in Bixler v. Church of Scientology Allegedly Contained Material Citation Errors and a Nonexistent Case
United States Bankruptcy Court for the Southern District of New York
Afectado por Incidentes
Large language model developers
Incidents involved as Developer
- Incidente 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
- Incidente 15711 Report
California Immigration Attorneys Reportedly Sanctioned Over Briefs Containing Probable Hallucinations in LNU v. Blanche
Large language models
Incidents implicated systems
- Incidente 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
- Incidente 15711 Report
California Immigration Attorneys Reportedly Sanctioned Over Briefs Containing Probable Hallucinations in LNU v. Blanche
AI-assisted legal research systems
Incidents implicated systems
- Incidente 16583 Report
State Farm Defense Counsel Acknowledged AI-Assisted Filings in Meni-Siliga v. A's Contractor, Inc. Contained Fabricated Legal Authorities
- Incidente 15711 Report
California Immigration Attorneys Reportedly Sanctioned Over Briefs Containing Probable Hallucinations in LNU v. Blanche