Lawyer uses ChatGPT to help write a brief, ChatGPT hallucinates cases and quotations. Court sanctions lawyer and 4 co-counsel (for not catching the errors). The lawyer who used ChatGPT "has practiced for over thirty years." He prompted ChatGPT: "write an order that denies the motion to strike with caselaw support ...." He told the court that he normally doesn't use ChatGPT and used it this time because he was caring for his dying family members. He said none of his co-counsel were aware of this use of generative AI. Court says that because "all five ... attorneys signed both documents that included these errors, and they admit that not one of them verified that the case law in those briefs actually exist ..., their conduct violates Rule 11(b)(2).