Article author should have written “interior Border Patrol checkpoint.”
You probably already know this, but their intent is to catch illegals who have hooked up with a pre-arrange US-based transporter (= Hispanic with a panel van) after successfully crossing the border on foot. Fairly common 25-75 miles of the border within in CA, AZ, NM, and TX.
Here’s a Wikipedia link on them:
http://en.wikipedia.org/wiki/United_States_Border_Patrol_interior_checkpoints
I did, and I thought it was apparent that my questions were rhetorical, but thanks for the link...I can still learn things,