Never the less, these people will have a name, an address, and other things identifying them as citizens, migrants, legal or otherwise. The police are charged with making life and death decisions on a daily basis; determining whether someone is an illegal alien needing deported is no different. No one who belongs here is going to be wrongly thrown out of the country. I'm sure if you were stopped, even if they wrongly decided you should be deported, I'm sure you'd have no problem showing your legal status, if you were actually a legal resident.