From what I understand the standing part of the Supreme Courts ruling is that a police officer can request proof of citizenship if they have reasonable suspicion they someone isn't legal, and it has to be in the course of otherwise typical law enforcement such as a traffic stop or such, profiling isn't allowed. My question is can someone give me an example of what could cause such reasonable suspicion, excluding of course the unlawful profiling of skin color, language, dress, etc. I'm not being snarky, I can't think of anything.