Law firms
Incidents involved as Deployer
Incident 7042 Report
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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Reportedly AI-Assisted Boies Schiller Brief in Bixler v. Church of Scientology Allegedly Contained Material Citation Errors and a Nonexistent Case
2025-07-30
Boies Schiller Flexner filed a respondents' brief in Bixler v. Church of Scientology International that was reportedly prepared with AI assistance and allegedly contained material citation errors. Opposing counsel reportedly identified mischaracterized and mistitled authorities, including one nonexistent case. Partner John Kucera accepted responsibility for failing to verify the citations and sought to replace the brief; the court denied that request and later considered monetary sanctions.
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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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