The validity of checkpoints has been upheld as long as they stop all cars and only look in the windows and ask for license/registration. It's used everywhere fo

The validity of checkpoints has been upheld as long as they stop all cars and only look in the windows and ask for license/registration. It's used everywhere for DUI policing, not just immigration checks. Doesn't mean it's not shitty, just that it's a different matter than border searches.