El Paso has a very colorful history, full of the good, the bad and the ugly. Most cities do but El Paso has been around a minute and one of its markers is the time it was "spitty".
You've seen them and, being unaware of this law as I was, probably didn't even bat an eyelash. Although, you may have raised an eyebrow. They are blatant about it, almost intentionally trying to draw attention to their flagrant lawlessness.