Yahoo v. Colorado Federal Prosecutors Battle Over E-mail Privacy
The fight is over a 1986 law that allows government access to e-mail over 180 days old without probable cause. Federal prosecutors argue that they may gain access before 180 days if the target of the e-mail search has accessed the message. The 4th Amendment on the front line once again over stored e-communications held by a third party.
Yahoo, Feds Battle Over E-Mail Privacy David Kravets, Wired, April 14, 2010