In the case of
McCarthy v. US Drug Enforcement Admin., No. 24-2704 (3d Cir. March 27, 2026 Phipps, J., Chung, J., and Roth, J.) (Op. by Chung, J.), in a matter of first impression, a divided US Court of Appeals for the Third Circuit issued a decision in which it reprimanded a Pennsylvania attorney whose work featured fabricated case law and various inaccuracies through artificial intelligence tools.
The court reprimanded the attorney involved for filing a brief that contained AI hallucinations. More specifically, the attorney filed a brief that included summaries of eight Drug Enforcement Administration adjudications that were generated by AI and supplied to him by a non-attorney. According to the Opinion, the attorney failed to verify the cases and the summaries, seven of which were filed with factual and legal errors, and one of which involved a case that did not even exist.
The court emphasized that the attorney involved not only failed to verify the erroneous citations generated by AI, but also failed to alert the court in this regard for months, even after the opposing attorney involved in the case identified the potential errors.
In a 2 to 1 ruling, the majority concluded that sanctions were warranted. The court found that the attorney violated Pennsylvania Rule of Professional Conduct 1.1 and Third Circuit Disciplinary Rule 2.1(d) by failing to provide competent representation.
The Third Circuit panel noted that, because it was this court’s “first opportunity to address the use of AI." The Third Circuit panel noted that since it had not notified the attorney in question that the court would consider whether his conduct violated Pa. R.P.C. 1.1, the court was electing not to issue monetary sanctions.
However, the majority noted that, going forward, attorneys could face any of the sanctions available under the Circuit Court Disciplinary Rules 4.1-4.2, including suspension and even disbarment.
Judge Roth concurred in part and dissented in part, opining that the attorney in question also violated Pa. R.P.C. 3.3(a)(1), by making a false statement of fact or law to a tribunal on at least two occasions. Judge Roth felt that more severe sanctions were warranted.
Judge Roth went on to note that the Majority did not need to warn attorneys to use artificial intelligence responsibly. She stated that “[n]o forewarning is necessary when it is clear what standard the attorney was required to follow.”
Judge Roth felt that the court could instead take notice of the numerous court decisions from across the country that have already addressed an attorney’s obligation to take ownership over their work product.
Anyone wishing to review a copy of this decision may click this
LINK.
Source: Article – “ ‘No Forewarning Necessary’: Divided 3rd Circuit Weighs Discipline For Attorney’s Use of AI Hallucinations,” By Riley Brennan of The Legal Intelligencer (March 30, 2026).
Source of image: Photo by Igor Omilaev from www.unsplash.com.