I went through this last week when a Michigan State Police trooper pulled me over because, supposedly, I have a brake light out (we checked it later, and found it to be not quite as bright as the other brake light, but still functioning). MI is a "must notify" state. I sat there with my hands on the steering wheel until he came to the door and asked for my driver's license, at which time I informed him of my cpl/carry status and then advised him that I was reaching into my back pocket for my wallet. I provided him with both my license and cpl, at which time he asked me where I was carrying my firearm, which I told him. He wasn't any too concerned about it, ran my license, and then advised me to replace the supposedly faulty bulb and let me go.