They can't find them because they live in the shadows.

I saw a fellow trying to order some food at a fast food place and couldn't speak english. We aren't supposed to think that he might be fresh from the border. Obviously he didn't get the memo about staying in the shadows.
I heard a report on the radio that although you can't deport 12 million people, you can enforce laws to the point they leave on their own. Sounds like there is a mass exodus from Arizona. Of course they aren't going south but going north and not leaving the states. They have it too good.