There's been plenty of posts here that have mentioned how much money is sent back to Mexico. Wadda ya think it's like in those villages when the actual BREADWINNER returns for a few months?
Has anyone here considered the incentive on the illegal's part to get into the system? Hint: think sex. As an added bonus, the nascent family stays in Mexico.
Once the whole operation is legit, they'll be able to cross the border just like everyone else. That being said, there's a couple of key factors to make the system work:
#1 Fingerprinting, and
#2 Criminal fines for hiring undocumented workers
Apply pressure on both sides of the equation, and we should get a very high rate of conformance.