Does MI have reciprocity with PA?
If not, you can carry in your vehicle but you cannot carry outside the vehicle.
If there is reciprocity, then you can carry most places, including the DMV and/or notary.
There is no duty to inform an officer during a traffic stop.
"The Marines I have seen around the world have, the cleanest bodies, the filthiest minds, the highest morale, and the lowest morals of any group of animals I have ever seen. Thank God for the United States Marine Corps. Eleanor Roosevelt, 1945"