What happened
In Mata v. Avianca, lawyers submitted legal material containing invented cases produced by ChatGPT. They then continued to stand behind the material after its accuracy was challenged. The court’s sanctions order imposed a $5,000 penalty jointly on the two lawyers and their firm and required additional corrective steps.
Source notes
The court’s written order is the primary source. The sanction involved failures to verify and subsequent conduct before the court; it was not a general penalty for using AI. The case’s dismissal and the sanctions were separate decisions.
What went wrong
The citations looked like legal authority, but the cases had not been verified in an authoritative source before filing.
What to notice and test
Find the original document in an authoritative collection. Confirm both that it exists and that it supports the statement being made. Asking AI to reassure you is not an independent check.
Try it together
Choose one factual statement from a short article. Follow its source link and see whether the original supports that exact statement.