Originally Posted by
kaszeta
According to the last CBP guy that checked my car, the fact that I was merely driving south (away from the border, as is everyone at the checkpoint) was probable cause.
For that matter, I got delayed once by 45 minutes since I refused to tell them where I was going other than "south", since, as far as I was concerned, once I had showed them my valid US passport there was no immigration reason for them to question or detain me.
What he said is wrong. He may have had other cause and didn't want to tell you what it was (he's not under any obligation to do so to you, only a judge). But if that was his "real" cause, then he's wrong, unless he's at a land border. At a checkpoint, not correct.