Over at TechDirt, Mike Masnick posts a thorough assessment of the DHS interpretation of its legal authority for search and seizure. As you could guess, they’ve analyzed away Americans’ civil liberties your their operational convenience.
Masnick concludes that
….if you’re playing along at home, DHS has decided, based on its own review of its own directives, that it can search any electronic device within 100 miles of the border without requiring a warrant, probable cause, reasonable suspicion or anything like that — because actually respecting the Constitution “would be operationally harmful” and wouldn’t really create any “civil rights/civil liberties benefits” for you.
The whole post is well worth reading, to see how one reaches that sad but entirely accurate conclusion of government policy.