Sure we can deport 12 (really 30 million plus) of illegals..
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.