Sorry but the evidence that this is true is the same as the evidence that dinosaurs are using bitcoin to stage a comeback.
Not to mention
I am the originator of any talk about the CIA using Bitcoin for field agents, and I don't care if they are. It's a viable method and one we should support.
The idea that governments shouldn't be using Bitcoin is absurd if we really want worldwide adoption.
EDIT: (3/14/2013) I still think this is a good idea. I know a lot of people probably ignored my original post, but this kook didn't. That said, just as with TOR, there is a very real benefit in intelligence agencies using Bitcoin to perform their operations. I'm not a CIA shill, I frankly don't care what they do, but Bitcoin is Bitcoin, we want everyone using it that wants a pseudonymous currency, from the small time nobody to the big time agency.