Sure, some, perhaps most can prove citizenship. Some or most isn't the issue. Once again, how do you propose dealing with a person who wants to work and who doesn't have proof of citizen ship? Do you deny them work? Do you deny them any form of assistance?
" Do you deny them any form of assistance?"
Yes!
Turn them over to the INS if they can't prove their citizenship, just like the law states. That's right bucko, there are laws dealing with people who can't prove they are citizens. If you don't have legal ID, there are laws you have to deal with. Life can be a bitch, but if you don't have ID, you brought it on yourself.