Well yeah, but why would the courts not be on board? Generally, traffic courts in this country automatically side with the cops unless you have a really, really good reason why the cop was wrong (or if the cop doesn't show up for the hearing). Traffic tickets are big money-makers for municipalities, so it's in their best interest to make it very hard for people to get out of them.
Good question, but that has happened here enough that the cops don’t enforce certain things.