Lawyers use it to draft legal briefs.
Court sanctions lawyers for fake citations generated by AI.
https://natlawreview.com/article/court-sanctions-attorneys-s...
AI is inherently unreliable and untrustworthy. In this case, distrust is not just some emotional reaction but pretty well grounded in fact.
Once lawyers learn this themselves from experience, I expect they will move toward legally impressing this upon any who are slow/reluctant to admit as much.
Using technology that is widely known to be flawed for any sort of serious work is a textbook example of "negligence".