A California appeals court has fined Los Angeles attorney Amir Mostafavi $10,000 after he filed a brief riddled with fake case citations generated by ChatGPT. The published opinion warns that no court filing should contain citations that an attorney has not personally verified. Court calls filing ‘frivolous’ and a waste of timeThe 2nd District Court of Appeal said Mostafavi’s filing broke court rules and amounted to a frivolous appeal. Mostafavi’s penalty appears to be the most costly fine issued by a California state court against an attorney over AI-generated text. AdvertisementExperts warn of growing wave of AI fabricationsDamien Charlotin, who tracks global cases of fake AI citations, told CalMatters that court filings containing fabricated case law have jumped from just a few a month to several a day.