the ones who have tourist visas (i.e. illegal worker with documents) do, but the true illegal (meaning one who has no permission to enter or work) is reluctant, given that he'll have to pay $1000 for a coyote to get him back into the US.
Just once I would love to NOT see bayourod on an immigration thread. I hope he is getting a good kickback from Karl Rove for his open borders blabber.
The skids are definately greased for the FTAA. No doubt about that one.