A lawyer used ChatGPT to generate briefs that included completely made-up witnesses and testimony while representing a man accused of shooting his wife. When he was caught by the judges, the lawyer blamed it on his own “stupidity.”

“It's little comfort to know that my stupidity is what brings us together this afternoon,” New Mexico attorney Stephen D. Aarons said in a hearing last month before five judges. He “assumed” ChatGPT would generate a “bulletproof summary of proceedings.” Instead, ChatGPT generated false testimony from “wholly fabricated witnesses,” according to an order of direct contempt from the New Mexico Supreme Court. Aarons was representing a man who was found guilty of killing his wife earlier this year; Aarons said he hadn’t told his client directly that he was caught using ChatGPT on the case because he’s currently serving life in prison.

The false testimony included a nonexistent person named Danny Stanton saying he received threats, and another made-up person, Linda Stanton, saying her husband received threats. Other false testimony from more AI-generated people in Aarons’ brief included statements “regarding the shooter’s clothing and appearance,” according to the order.

Reuters reported on the case earlier this month. "I am remorseful but hopeful that the disciplinary board takes into account it was an honest mistake," Aarons told Reuters. "It is a lesson learned for all professionals who rely upon this powerful but sometimes unstable technology."