The Mr. and I are going to New Mexico next week, and will be driving through an area where I know there are CBP checkpoints. Last time I went through, they hassled me pretty badly about producing a passport, which I had only because I prefer to use it at the airport. Yes, they actually cared enough to make me get out of the car and dig through my luggage for it. I was alone, in the middle of nowhere, and didn't want to end up arrested.

The problem is that the Mr. does not have a passport. Since he is legally not required to show it for domestic travel (right?), what are our options if CBP demands them again? Has anyone else had trouble at these roadside checkpoints in border areas?