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I have been pulled over by an unmarked vehicle before, with the lights hidden in the grill.

And my daughter got pulled over by a bicycle cop. No lights or nothing. He rode up, tapped on her window, and told her to pull over. She didn't believe him, so she didn't pull over. But she found out that bicycle cops have friends with cars, and lights... and guns too! A real learning experience, shall we say.

So yeah, I think unmarked vehicles can make traffic stops.

I like "perp". I think that is going to be your new nickname.