Formally the police can't demand a lot of stuff. Informally, they'll put you in a room and tell you that they have the legal right to keep you anywhere from 24 to 72 hours in there and they definitely can make you reconsider during that period -- to put it very mildly. Hint: some cops are really good in the skill of inflicting pain to people without lasting medical trace to prove it afterwards. Until there's true acc…
It's crazy to me the amount that people who have never dealt with the cops think "I'll just show them x legal code so they can see they don't have the right to do that." Turns out, they don't care. For minor infractions, they'll use whatever intimidation and coercion they want, then make you feel lucky for letting you out because they didn't feel like prosecuting. In most circumstances, the word of the person with th…
I've dealt with lots of cops for minor stuff (trespassing, traffic infractions, crashed parties), and have only had a bad experience (turned out fine anyway) once. I have several relatives who have been in and out of the system, and from my point of view, they were probably treated more fairly than they deserved. I get that that is not everyone's experience, but it makes me skeptical that the problem is somehow grand and structural and not just "some people are assholes."