they have them in west Texas about 100 miles or so from the border. And yes, they ask for ID, ask questions, bring dogs up to sniff the car ect. They stop everyone, even the few locals that live in the area.
the one I am talking about is just West of Del Rio on the interstate. Nothing beyond that to the west except rocks and dust (we have a family ranch out in the middle of that nothing on the Rio Grande about an hour west of that check point) lol
Ok then, I did not know that. I guess I have not traveled as far and wide as I thought.