Omaha attorney Greg Lake filed an appellate brief with the Nebraska Supreme Court in which 57 of 63 case citations were later found to be defective, including 20 outright hallucinations and 3 entirely fabricated cases generated by an undisclosed AI tool. Lake initially denied using AI when questioned by the justices during oral argument, then reversed course and admitted in an affidavit that he had used generative AI to draft the brief without verifying the citations. The Nebraska Supreme Court suspended him from practicing law until further notice and ordered a full disciplinary investigation, described as the first indefinite bar suspension in the US tied to AI-related filing errors.