The laws Arizona put on the books seem to be a duplicate of federal law. And State can enforce federal law, this is something Arizona could have been doing without having to create a duplicate set of laws. I wonder if the whole thing was just for show to throw a big monkey wrench into Obama and congress and make them look bad. Looks like more psychological operations, since the whole thing was unnecessary and the laws could have been enforced by the state police from the beginning without this dog and pony show. So in the end it looks like another obstructionist game.