But what gives them the upper hand on this? If a cop assumes the motorcycle is loud its loud, do we have a law in place for that? I've gotten a ticket for my muffler but the cop measured it to prove it was in violation, this one didn't

Hello I got pulled over by a cop that was giving tickets to pedestrians and cyclists, and they assumed that my bike was to loud (dind't check my muffler) and assumed I was speeding (no radar gun or anything like). Can they do that??