I can't believe that some professors do this! I mean I can understand if the same person gets up at the same time during class everyday, but an outright ban? If it's not in your law school handbook, (which I doubt) I would say ignore the rule and do as you please. Especially if there is anonymous grading. If the prof has a problem with that, contact the dean of students. There's no excuse for the prof being such an a**hole.