I got a run-down 6 months ago from our local city cops on how illegals are used in the drug trade.  It's quite impressive.  A family of 4 wants to cross the border.  It's free, with a few 'strings attached'.  Everyone goes to different states.  When you get there, within a week or so, you get an apartment, a backpack, a cell phone, keys to a car, and some money for food.  Your cell phone gives you the address to deliver the backpack to.  It gives you the location to pick up your next backpack.