If they’re in plainclothes, feel free to ask to look at the officer’s credentials. Just keep in mind that you don't know what an authentic police ID card for that agency looks like. (I don't know what official ID cards for the surrounding agencies look like, either.)
Yep, we're too stupid to read, too stupid to figure anything out for ourselves, we're just the stupid public. And some cops wonder why we don't particularly care for them. When the "force" treats us as being stupid and ignorant, that tends to be the attitude returned.
When I explain the exact ordinance I want enforced and the cops wants to know if I have a law degree it tends to infuriate educated people. You don't have to be a lawyer to READ the local ordinances and laws.