Yes, the FBI and CIA can read your email. Here's how:
Gen. David Petraeus, the former head of the U.S. Central Intelligence Agency, resigned over the weekend after he was found to have engaged in an extra-marital affair. What caught Petraeus out was, of all things, his usage of Google’s online email service, Gmail.
This has not only landed the former CIA chief in hot water but has ignited the debate over how, when, and why governments and law enforcement agencies are able to access ordinary citizens’ email accounts, even if they are the head of the most powerful intelligence agency in the world.