New Mexico Supreme Court fines lawyer $5,000 over AI-made witnesses

In short: New Mexico’s Supreme Court fined a lawyer $5,000 after it found his murder appeal brief included made-up witnesses and other false details generated with ChatGPT.

What happened

New Mexico’s Supreme Court punished lawyer Stephen Aarons for submitting an appeal in a murder case that included information the court says was not real. The court fined him $5,000 and held him in contempt, which is a formal finding that he disobeyed the court’s rules.

According to the court filing, Aarons failed to check the facts and legal references in an AI-generated “brief” (a written argument lawyers file with a court). The court said the brief included “false testimony from wholly fabricated witnesses,” plus false police testimony. It also included false details about the shooter’s clothing and appearance.

At an August hearing, Justice C. Shannon Bacon questioned how Aarons could use AI without understanding the risks. Aarons admitted he used ChatGPT and believed it would create a “bulletproof summary” of the trial. The justice compared the problem to a daily headline, noting that AI can “hallucinate,” meaning it can make things up while sounding confident (like a student turning in a book report on a book they never read).

Aarons told Reuters he was remorseful and said it was an honest mistake.

Why it matters

More lawyers are using AI tools to help write and research. This case is a clear reminder that courts expect lawyers to verify everything they submit, even if it comes from AI. For regular people, especially anyone involved in a legal case, it shows why AI-written documents still need careful human checking.

Source: The Verge AI