OK, your not going to be breaking any laws anytime soon. That doesn't mean you should not be on the lookout for your local police.
In the recent firetruck/car crash I saw this paddy-"wagon". Pretty sneaky. Here is a shot of it from my balcony. Notice: the ski bars on top, blacked-out windows, regular license plates and sporty look.
They don't even wash it so it blends in even more.
Verrrry sneaky.