Jason Holder—Senior Attorney
ATTORNEY ETHICS: How to Make a Bad Situation Worse: Court Sanctions Attorney for Using Hallucinated Cases to Defend Himself Against Motion Alleging Prior Use of Hallucinated Cases
In a cautionary tale for attorneys seeking to use artificial intelligence (“AI”) technology in an effort to save time and money, a New York trial court has sanctioned counsel for relying “upon unvetted AI—in his telling, via inadequately supervised colleagues—to defend his use of unvetted AI.” Ader v. Ader, 2025 N.Y. Misc. LEXIS 7848, at *1, 2025 NY Slip Op 51563(U), 1, 87 Misc. 3d 1213(A), 240 N.Y.S.3d 701 (Sup. Ct. N.Y. County Oct. 1, 2025). The initial offense was brought to the court’s attention when the opposition “identified inaccurate citations and quotations in Defendants' opposition brief that appeared to be ‘hallucinated’ by an AI tool.” Id. at *3. Without admitting or denying the use of AI, the offending attorney initially suggested that the passages cited by the opposition “were intended as paraphrases or summarized statements of the legal principles established in the cited authorities.” Id. Rejecting this argument, the court noted that the “paraphrases” included “bracketed terms to indicate departure from a quotation (not something one would expect to see in an intended paraphrase) and comments such as ‘citation omitted.’” Id. at *4. Compounding matters, the cases cited relied upon for the alleged paraphrases of law “did not stand for the propositions quoted, were completely unrelated in subject matter, and in one instance did not exist at all.” Id.
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