And the best way to inform I've ever heard about is that when the officer asks for your ID, quietly hand him that and your permit at the same time. Don't say gun. A rookie with his training officer on his first traffic stop (something even laymen are told is one of hte most stressful things they do day in and day out) or an hysterical bystander...
It came from Masaad Ayoob in a Youtube video as an advertisement for his books. It's a good watch for how to inform, how to act. Most people involved seem to either(for reasons I don't know, haven't been around long enough to understand it, just to know it happens) worships at his feet or wants to burn him at the stake. But even the people who want to burn him at the stake usually agree his common sense stuff is good to know.