Asking questions is an essential part of police investigation. In the ordinary sense a police officer is free to ask a person for identification without implicating the Fourth Amendment.
“I come from a small town and I come from a background where we didn't have money to travel. I thought I'd have to join the military to get to Europe. So I'm thrilled to travel.”
“Women are one of the Almighty's enigmas to prove to men that He knows more than they do.”