Unstickered police cars, illegal?, Have you seen these? Options

[monkeywrench]

Maybe I'm new to this or my town has a unique police force-but here is the story. I get pulled over one day this week, and the police car that got me was a Dodge Charger, that had NO stickers designating it as a police car. But the people in the car were DEFINATELY police officers. In my area of the the U.S. (im not sure about other parts of USA), the cop cars we have are Ford Crown Victorias, Chevrolet Impalas, and a few Dodge Chargers. I'd told a friend and he asked me if that was illegal and I didn't know. At a glance you couldn't tell it was a police car, but the siren light were tucked up in the grill and headliner. So I'm asking if any of you have seen police cars like this, or had this experience?

[missmoster]

Hey ya we got them here in nz we call them muffty cars or undercover cop cars but ya can generally pick them out when ya get used to them over here most of them have steel rims and drive holdens