Can the FBI and CIA read emails?

The fallout about Gen. David Petraeus continues, but the CIA and FBI seems to have access to Petraeus’s emails about his affair with his mistress. He may have resigned, but he’s not off scot-free yet.

But could this mean both the FBI and the CIA have the ability to read and impound emails from anyone with and without warrants? Imagine the CIA having the ability to tap into your computer and collecting data about your Internet activities, such as email, sites visited, keystrokes, etc., and perhaps erasing stuff that are critical to the government.

But in the digital technology age, cyberspace is perhaps still the limit.

Read more at ZDNet.com