At the very end of the audio, they say they were detained for another two hours by the U.S. Border Patrol and were told their Fourth Amendment rights do not apply there.
Unfortunately, I have been told that's true. I have a friend who has been working under contract for the Border Patrol for several years now and he told me a few months ago that the Border Patrol does not need a search warrant within 50 miles of a U.S. border. Think about that for a moment.
Borders are not only those dividing lines between us and Canada or Mexico, they are also coastal areas as well. That means there are one hell of a lot of people who are subject to warrantless searches by a potentially rouge agency and no Constitutional protections can apply.