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Lawyer Cites ChatGPT-Invented Fake Witnesses in Murder Appeal
(www.404media.co)
This is a most excellent place for technology news and articles.
There is a rule that covers fake citations, AI or not. But it's not immediate.
What's happens is the court makes a disciplinary referral to the state bar association, which handles barring and disbarring. At minimum there's some kind of additional bar discipline hearing before adverse action.
Each federal court, district or appellate, can also independently revoke admission to the bar of that individual court.