I'm confused. Did he detain them or did he pick them up?
He picked them up, they were hitch-hiking. He took them to a BP station further up the road.
He was detained, probably to confirm the story, and released. Now, that's my impression of what happened. I doubt that you'll see that reported anywhere...especially not by the ACLU.
Oh, and Ray Ybarra is also the ACLU rep from Douglas, AZ. He sure gets around a lot, don't you think?