"Counsel Relied upon Unvetted AI … to Defend His Use of Unvetted AI"

From Ader v. Ader, decided last week by N.Y. trial court judge Joel M. Cohen:

This case adds yet another unfortunate chapter to the story of artificial intelligence misuse in the legal profession. Here, Defendants' counsel not only included an AI-hallucinated citation and quotations in the summary judgment brief that led to the filing of this motion for sanctions, but also included multiple new AI-hallucinated citations and quotations in Defendants' brief opposing this motion. In other words, counsel relied upon unvetted AI—in his telling, via inadequately supervised colleagues—to defend his use of unvetted AI….

Plaintiff [had] identified inaccurate citations and quotations in Defendants' opposition brief that appeared to be "hallucinated" by an AI tool. After Plaintiff brought this issu