Thomson Reuters
Incidents involved as Developer
インシデント 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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Westlaw CoCounsel Reportedly Generated False Legal Quotations in United States v. Farris
2025-10-21
In United States v. Farris, court-appointed attorney Steven N. Howe admitted using Westlaw CoCounsel to draft appellate briefs that reportedly included AI-generated false quotations and misleading descriptions of precedent. The filing disrupted Farris's appeal, leading the court to appoint new counsel and restart briefing, while Howe lost his compensation and faced possible disciplinary action.
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