http://www.slate.com/blogs/future_te...ing_power.html
(snip)

Despite the pervasiveness of law enforcement surveillance of digital communication, the FBI still has a difficult time monitoring Gmail, Google Voice, and Dropbox in real time. But that may change soon, because the bureau says it has made gaining more powers to wiretap all forms of Internet conversation and cloud storage a “top priority” this year.

(snip)
Isn't that a little like opening ordinary mail without a warrant?