Law enforcement can be inherently prejudicial. If you dress up a little, it helps. Just enough so the good officer wonders, who is this guy in the jacket and tie? They don't want to hassle the senator's son or the mayor's nephew, or some partner in a law firm. That gives you just enough time to establish yourself as okay, if you do. Keep your hands in view, etc. It's much worse now, I think. In the Navy, in civvies, I dozed off in a park against a tree after too much vodka (not much, but that's me). Plenty of people around, and some police. No one had a problem, but that was the Age of Aquarius. They figured if he's asleep, he won't cause any trouble. Not today.