WASHINGTON – Your emails are not nearly as private as you think.

The downfall of CIA Director David Petraeus demonstrates how easy it is for federal law enforcement agents to examine emails and computer records if they believe a crime was committed. With subpoenas and warrants, the FBI and other investigating agencies routinely gain access to electronic inboxes and information about email accounts offered by Google, Yahoo and other Internet providers.

"The government can't just wander through your emails just because they'd like to know what you're thinking or doing," said Stewart Baker, a former assistant secretary at the Department of Homeland Security and now in private law practice. "But if the government is investigating a crime, it has a lot of authority to review people's emails."