[EternalVigilance]

It still won't have any assurance of finding everyone.

And E-Verify will?

[ConservativeMind]

At some point, people will either need to get money to live on. When arrested from a crime, they can be checked, when picking up money, they could be checked, and when getting a job, yet again.

Of course, you’d want everyone to show a birth certificate for all such activities, but that’s not really enough.