Why *.jpg? Do they just assume everyone is smuggling porn on laptop hard drives or something? You'd think if you were looking for evidence of terrorism or immig

Why *.jpg? Do they just assume everyone is smuggling porn on laptop hard drives or something? You'd think if you were looking for evidence of terrorism or immigration issues you'd be more interested in emails and documents. These searches, if true, have nothing to do with border security and more to do with fishing for anything and everything they can charge you with once they aren't encumbered with warrants and courts and due process.