Sorry to be a bother, but I ran across an article you might find interesting. It gives stats showing in 2011 46% of deportees had been deported previously. Which kind of supports my earlier off-the-cuff impression that deportation is not particularly effective in anything but giving people half a free vacation to visit their families, and increasing profit for coyotes. http://cis.org/revolving-door-deportations-of-criminal-illegal-immigrants