# New Mexico Supreme Court sanctions lawyer for AI‑generated brief with fabricated testimony

Digest AI · Policy & Regulation · published 2026-09-11T18:04:05Z · updated 2026-09-11T20:44:02Z

Canonical: https://digestai.news/story/new-mexico-supreme-court-fines-lawyer-5-000-for-ai-generated-brief-with

## Summary

A New Mexico criminal‑defense attorney, Stephen Aarons, was held in direct contempt after filing an appellate brief that relied on ChatGPT‑generated content containing entirely fictitious witness statements and erroneous legal citations. Aarons admitted he never verified the facts or sources produced by the AI and failed to inform his client, Oscar Renee Sandoval, whose murder conviction the brief was meant to challenge. The state Supreme Court noted the brief cited made‑up police officers and fabricated threats, prompting a motion to strike the false portions and a referral to a disciplinary board.

The court’s order highlighted the growing risk of unvetted AI output in legal practice, emphasizing the duty of lawyers to ensure accuracy and transparency. Aarons, a veteran with over four decades of experience, now faces potential sanctions and a review of his professional conduct, underscoring that reliance on generative AI does not excuse negligence or ethical breaches.

Legal experts warn that this case could set a precedent for how courts treat AI‑assisted filings, urging stricter verification protocols and clearer guidelines for attorneys using large language models in their work.

## Key points

- Stephen Aarons submitted a brief with fabricated witness testimony generated by ChatGPT
- The New Mexico Supreme Court held him in direct contempt and referred him to a disciplinary board
- The case raises warnings about unverified AI use in legal filings

## Why it matters

The ruling signals that courts will hold lawyers accountable for AI‑generated errors, prompting the legal profession to adopt stricter verification standards and shaping future AI governance in law.

## Sources

1. [ChatGPT-using lawyer punished for citing fake testimony from made-up witnesses](https://arstechnica.com/tech-policy/2026/09/chatgpt-using-lawyer-punished-for-citing-fake-testimony-from-made-up-witnesses) (Ars Technica AI, 2026-09-11)
2. [Lawyer fined $5K over AI-hallucinated witnesses in a murder case](https://theverge.com/ai-artificial-intelligence/994207/chatgpt-new-mexico-lawyer-fined-murder-appeal) (The Verge AI, 2026-09-11)
3. [New Mexico lawyer fined for using AI-generated brief containing fabricated police testimony](https://theguardian.com/technology/2026/sep/11/new-mexico-lawyer-ai-chatgpt-testimony) (The Guardian AI, 2026-09-11)

## Cite

Digest AI, "New Mexico Supreme Court sanctions lawyer for AI‑generated brief with fabricated testimony", 11 September 2026, https://digestai.news/story/new-mexico-supreme-court-fines-lawyer-5-000-for-ai-generated-brief-with

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