[Retric]

If you see a checkpoint at sufficient distance to make a legal u turn before interacting with the police yes.

If a police officer is pointing at your car because they are going to search you no.

[dekhn]

So?

You made a series of factually incorrect statements which I have debunked based on trivially determined facts.

[Retric]

So I realized you misunderstood what I said.

For example, I said they operate in Texas as you called out California as your example. Texas doesn’t allow sobriety checkpoints but it’s an entirely new states worth of legal issues here.