“‘Apple iMessage users should be aware that regardless of what they heard last week, their messages can be easily obtained by law enforcement pursuant to a warrant under the Electronic Communication Act [ECPA],’ said Alan Butler, an in-house attorney with the Electronic Privacy Information Center (EPIC). ‘Even though the messages are encrypted by the phone company as they are sent by iMessage, Apple can decrypt messages and hand them over to law enforcement with a warrant!’”
http://stopthedrugwar.org/chronicle/2013/apr/16/are_we_really_going_dark_dea_and