yup I had some blue lights on my previous car, a cavalier, and the cop made me cut the wires or he was going to give me a $150 ticket per light. And he said the same thing, it could make someone think I was a cop. So Stupid! When we cut the wires it blew my taillights out, blew a fuse, he pulled me back over and told me then followed me home.
But I was told when I installed my lights that any color besides blue and red is at the discression of the officer as to what they can do with the lights, as in giving tickets or whatever.