We can use the same system the IRS uses. They are totally incompetent organization, but when they want to find someone, they do. 12 - 30 million ought to be a piece of cake.

I say trick them, tell them to register for a TAX ID #, so we can see how many illegals are here so we can consider amnesty. Once you have them registered...nab them and deport them, unless they want to pay back taxes and a hefty fine.

Triple the fines and penalties with some jail time on the first offense for employers.