Judge Reprimands Ex-DOJ Attorney Over AI-Generated Brief
A federal judge formally reprimanded former DOJ attorney Rudy Renfer for filing an AI-generated brief with false citations.
Why it matters: The case underscores mounting ethical and professional risks as attorneys adopt AI tools in legal drafting. Law firms and in-house teams face renewed scrutiny to ensure compliance, accuracy, and due diligence when leveraging AI.
- U.S. Magistrate Judge Robert T. Numbers II reprimanded Rudy Renfer on April 28, 2026, for submitting an AI-written brief with fabricated citations.
- Renfer admitted to using AI after accidentally overwriting his original work and resigned following a March 10, 2026, hearing.
- The U.S. Attorney's Office referred the incident to the DOJ's Office of Professional Responsibility and issued warnings to its staff.
- Judge Numbers called Renfer's conduct 'odious' and said his professional reputation is 'in tatters.'
On April 28, 2026, U.S. Magistrate Judge Robert T. Numbers II issued a formal reprimand to former Assistant U.S. Attorney Rudy Renfer for submitting a legal brief drafted by artificial intelligence that contained fabricated citations and misquoted case law. (Courthouse News)
- Renfer, who had served in the U.S. Attorney's Office for the Eastern District of North Carolina for 17 years, admitted during a March 10, 2026, hearing that he used an AI tool to reconstruct the brief after accidentally overwriting the original document.
- The judge described Renfer's actions as "particularly odious," emphasizing that "an attorney who outsources core research and writing obligations to generative AI assumes the risk that its output will contain fictitious authority." (Bloomberg Law)
- Renfer resigned from the U.S. Attorney's Office shortly after the hearing. The matter has since been referred to the Department of Justice's Office of Professional Responsibility for further inquiry. (News & Observer)
- In response, the U.S. Attorney's Office circulated a warning about the pitfalls of using AI in legal work and scheduled new staff training to mitigate future risks. (Public Radio East)
The incident is the latest in a series of high-profile cases, including the 2023 Mata v. Avianca, Inc. sanctions, that highlight the dangers facing legal professionals who fail to rigorously verify AI-generated content. As more law firms adopt AI, close oversight and robust compliance protocols are essential.
By the numbers:
- 17 years — Renfer's tenure at the U.S. Attorney's Office
- April 28, 2026 — Date of Judge Numbers' formal reprimand
- March 10, 2026 — Date Renfer admitted using AI in court
Yes, but: Specific details about the AI tool used and the exact nature of the fabricated citations were not disclosed.
What's next: The DOJ’s Office of Professional Responsibility is reviewing the incident.