I live in new mexico. I have known of this for years. since I moved here actually. I have heard it on local radio more then once. at one point they caught maybe it was a dozen or so guys, all middle eastern. wearing american flag T shirts and pockets full of cash. they gave some numbers amounting to I believe a few thousand a year. (but its been awhile)
a few years later,, the next things I heard on the subject was, that the middle eastern men were now dressing as if they were from mexic, even changing their hair, and learning spanish..... that was maybe 1.5-2 years ago I heard that.......