Originally Posted by phidauex
If you have no ID and they can't verify your identity, I think they can bring you in to verify, which could be highly unpleasant, even if there are no long term reprocussions.
No they can't, at least not in the US. The US has no mandatory ID requirement nor does it have internal checkpoints (except now it does...War on Terra and all). You are required to truthfully state your information but you do not have to carry proof of same.
If the officer suspects you're lying, he may arrest you, but upon verification of your ID, they can be looking at an unlawful arrest suit (good luck successfully prosecuting, though).