What is he in fear of? I hear about so much "fear" from Hispanic citizens and legal residents, but I really don't know what they're afraid of. The slight possibility that they may be asked to identify themselves to a law enforcement officer? I prefer to exercise my rights to silence and privacy whenever possible, but I'm not really "afraid" of identifying myself to the law, I just find it distasteful.
The bogey man that has been created by the left, not this law.
If he continues his perfectly clean record, and is never stopped by a cop, then this law will not affect him personally. If he is stopped, all he has to do is show his Arizona driver's license, something he would normally have to do anyway. Even then the law won't affect him, because a license is proof of legal status under the law.
If he is stopped by a cop for no reason other than to ascertain his citizenship, then he can have a good time getting that cop fired and probably getting a fat settlement from the city.