This is why people have lawyers on retainer, or have a lawyer friend that they can call at the drop of a hat/ know on the door. If you don't know any lawyers personally, I'm not sure what to tell you, I met all of my lawyer friends while I was studying for my degree, and they were in law school.

The nice part is that they just have to be a lawyer most of the time. The cops in the US don't know the law, aren't trained in the law, and treat lawyers like the kryptonite that they are to cops.