"Google demands probable-cause, court-issued warrants to divulge the contents of Gmail and other cloud-stored documents to authorities in the United States — a startling revelation Wednesday that runs counter to federal law that does not always demand warrants.

The development surfaced as Google publicly announced that more than two-thirds of the user data Google forwards to government agencies across the United States is handed over without a probable-cause warrant.

A Google spokesman told Wired that the media giant demands that government agencies — from the locals to the feds — get a probable-cause warrant for content on its e-mail, Google Drive cloud storage and other platforms — despite the Electronic Communications Privacy Act allowing the government to access such customer data without a warrant if it’s stored on Google’s servers for more than 180 days.

“Google requires an ECPA search warrant for contents of Gmail and other services based on the Fourth Amendment to the Constitution, which prevents unreasonable search and seizure,” Chris Gaither, a Google spokesman, said"

http://www.wired.com/threatlevel/2013/01/google-says-get-a-warrant/