hahahahahahahahhhahahahahahha."Misplace" your driver's license. When you go to get a replacement, go on your way to or from work - in uniform, of course.
Yeah. Don't do this. It is a monumentally bad idea on so many different levels. First of all, your department will probably prohibit it. Second of all, your coworkers will mock you incessantly as soon as they find out you did it. Prepare to have the most-commonly-run license in the city as everyone wants to see what dork put himself in a uniform on his DL. Third of all, I would absolutely laugh in the face of somone who handed me a license with a picture of himself in a police uniform. And then I would call his PD to make sure he wasn't a faker. And make sure they knew precisely who I was calling about, and what he was doing. And then I would give him a ticket. Mostly for being an idiot. And, finally, there's the fact that you would be advertising to everyone who has occasion to look at your DL that you're a cop. Like, for instance, the guy who stole your wallet. Who now knows where you live. Or the guy robbing the restaurant and collecting wallets. Etc.
Bad idea.
Mike