One example that comes to mind was Vertigo (1958). The hearing was held in some sort of building which looked anything but like a courtroom. Law Schools do have practice ones probably, but the last time I tried to shoot a scene at a college, they wanted me to put down a two million dollar deposit, in case anything was damaged, so I scrapped that idea. I'm assuming the law division of the campus grounds would have a similar rule, but I can always ask.