If you live in a jurisdiction where “one party” recording rules apply, whenever interacting with any “authority figure,” record the interaction. If the interaction is with a LEO, record it no matter what (1st Amendment and due process protections should apply, at least according to some recent federal court decisions). Just in case, ya know.
Oh, and having one’s own dash cam? Great idea. I got lucky once, about 30 years ago, and had a judge who was very familiar with a particular stop sign (it was in his neighborhood and he stopped at it all the time) and KNEW the LEO could NOT have seen what he testified he saw.