Posed this question to a buddy of mine who is a traffic cop in Grand Haven. He said he has a code to write a ticket for no rear view mirror, but does not have a code to write a ticket for no side view mirror. Also said he has never looked for Jeeps with no doors, thus no mirrors, to write a ticket. He was qiuck to add that he was sure there were officers out there that probably have a hard on to write such tickets. With a little more digging, it was my understanding that having a rear view and a side view mirror was a Federal Law.
I have been running my YJ all summer with no doors, but I did add a Cipa roll bar mount morror on the drivers side, just to cover my a$$. Works fine, and only cost $15.00!