Why we don't need this law.

I decided to come up with a little scene of why I dislike this law. This is what I feel could happen.

Police pulls over an american citizen for a broken tail light.

Police: Can I see your drivers liscense?
American citizen: Sorry I forgot my DL. I was in a hurry to get to work and left my wallet at home and borrowed money for lunch.
Police: Sir, I noticed that you are speaking with an accent. Are you an american citizen?
AC: Yes.
Police: Can you show something that says you are an american citizen?
AC: No. I left my DL at home like I said.
Police: Sir you are under arrest for not being able to prove you are an american citizen?

Normally to Officer would have just issued a citation for not having a DL while operating the vehicle. Now the officer has to take the american citizen to jail. Just because of his accent or he looks like a foreigner.