Please note my words very carefully. If you ever get pulled over for any reason, and the officer only warns you, but you think you're being harassed, DO NOT ASK FOR THEIR BADGE NUMBER. They'll have a name badge on, and there's a unit number on the car. If you ask for their badge number, I can almost guarantee they will find something to write you a ticket for.

If they get a complaint that they pulled someone over, and did not write a citation, it leaves the onus on them to prove they weren't harassing you. If they give you a citation, it's much easier to just write you off as a disgruntled offender.