Now Playing: 4-15-13 Marketplace Tech: Your Email and the IRS

Can the IRS look through your email without a warrant -- and does that run contrary to the Fourth Amendment? Documents obtained through a Freedom of Information Act request by the ACLU seem to suggest as much, but the IRS has said it doesn't use email to target taxpayers. While millions of Americans pop their returns into the mail today, we look at issues of data, privacy and the law.