New Mexico Supreme Court Fines Lawyer $5,000 for AI-Fabricated Witnesses in Murder Appeal

The New Mexico Supreme Court has fined attorney Stephen Aarons $5,000 and held him in contempt for submitting an appeal in a murder case that leaned on witnesses and police testimony that do not exist, according to a Wednesday filing first reported by Reuters. The court found Aarons failed to verify the factual claims and legal citations in his client's appeal before filing it. It is one of the first state supreme courts to impose a financial penalty on a lawyer for passing off AI-generated material as evidence.

The fabricated content was not a stray citation error. Aarons' filing named people who were never involved in the case and quoted statements attributed to police that were never made, according to the court's order. The appeal was meant to challenge his client's murder conviction, which means the invented testimony went directly to the heart of the argument. The court's contempt finding signals that judges are now willing to treat AI hallucination as a disciplinary matter rather than a clerical slip.

Courts across the country have spent the past two years issuing standing orders requiring lawyers to disclose generative AI use and to certify that every citation has been checked against a real source. Most of those cases ended with warnings, reprimands or mandatory training. Aarons' penalty is notable because it pairs a dollar figure with a contempt holding, which can carry additional consequences for his license and practice. The New Mexico Supreme Court did not treat the mistake as harmless, even though the underlying conviction was not overturned on the fabricated claims.

The timing matters for defense attorneys, who often work under tight deadlines and thin budgets and may be tempted to use AI tools to draft appeals faster. Prosecutors and bar disciplinary boards have been watching for a test case that establishes real teeth behind the disclosure rules. A $5,000 fine is modest compared with the cost of a legal malpractice claim or a bar suspension, but the contempt label follows the attorney and can be cited in future disciplinary proceedings.

What remains unresolved is whether Aarons will face a separate bar investigation, and whether the court will require him to notify his client about the fabricated material. The client's murder conviction still stands, and any future appeal will have to be rebuilt from verified records. For other lawyers, the practical lesson is blunt: AI tools can generate plausible names, quotes and case citations, and no court is accepting the excuse that the software made them up.