An anonymous reader writes: "Petraeus-gate," some U.S. pundits are calling it. How significant is it that even the head of the CIA can have his emails read by an albeit friendly domestic intelligence agency, which can lead to his resignation and global, and very public humiliation? And, it's not just limited to U.S. citizens. Through the Patriot Act, they can access EU/U.K. and Australian citizens' data, too. Here's how they do it.