A number of years ago I was at a class hosted by the Pinal County (AZ) Sheriff's Dept. There were a few BORTAC guys in the class. Some of the stories they told were absolutely mind blowing. Mexican Army HMMVs with mounted M2s 50 miles inside the US. Platoon strength elements armed and in uniform crossing the boarder regularly. Constantly being told to stand down, not engage, back off. It sounded like a very frustrating job. Mind you this was about 2006 or 7. I can't imagine things have gotten less silly down there.