I've been stopped before in So California driving into Arizona, and also in New Mexico/Texas area somewhere around El Paso. I think the total stop for me was like 10 seconds. It's more or less something like, you're a US Citizen? Where are you headed? Just as long as they stop everyone then it's legal. They can't pick and choose who they stop. NOW, if I'm in a bad mood and trying to make time, then I'm probably not going to be happy about it. But, my life is complex enough so I don't want to add to my total quantity of things to think about.