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Another AI Hallucination Case

By Julie Tappendorf on March 31, 2026
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Although today’s case summary isn’t related to local government issues, it is an important reminder to be careful in relying on AI (artificial intelligence) for legal work, particularly in filings with the court.

In Dec v. Markwayne Mullin, the Seventh Circuit Court of Appeals addressed a challenge by a Polish citizen who was denied a waiver of the waiting period for a family-based visa that requires a person to leave the country and remain abroad for ten years. The Department of Homeland Security (DHS) denied her waiver request and she sued. The district court dismissed her lawsuit, holding that the applicable federal law precludes judicial review of agency decisions on waiver requests. She then appealed to the Seventh Circuit Court of Appeals, which upheld the dismissal of her case.

In addition to upholding the dismissal of her case, the Seventh Circuit also addressed deficiencies in the appellate brief filed on her behalf by her attorney. The Court noted that her brief cited two cases that do not exist and included an imaginary quotation, which the Court noted had “tell-tale signs of AI hallucinations” (although the plaintiff’s attorney argued she did not use AI in her brief). The Court acknowledged that courts have been grappling with the use of generative AI in briefs filed with the court, particularly when it produces AI hallucinations and non-existent case citations. The Court expressed its concerns, particularly that trained lawyers are failing to check the accuracy of legal citations and quotations in their filings with the court. The Court was not only concerned about the plaintiffs’ counsel inclusion of these hallucinated cases, but also the fact that opposing counsel in the case (DHS attorneys) failed to catch these errors and bring them to the attention of the court. 

The Court’s discussion is a reminder to all lawyers and parties to litigation that they exercise caution in their use of AI in drafting briefs filed with the court and to double-check their legal arguments and any supporting citations. That cautionary reminder is not restricted to the attorneys filing with the court, but also to opposing counsel who fail to catch these errors.

Municipal Minute is authored by Julie Tappendorf, a partner at the Ancel Glink law firm in Chicago, to provide timely legal updates on topics of interest to local governments.

      
  • Posted in:
    Government
  • Blog:
    Municipal Minute
  • Organization:
    Ancel Glink, P.C.
  • Article: View Original Source

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