We know from Casey Jones arrest that the DEA holds bitcoin (at least they hold his). To the address owners... ever buy anything on silk road?
Given the recent revelation from Snowden it's clear that the NSA has been around decades longer than bitcoin. They are adding bitcoin information to the omnipotent data they already own, if they didn't invent bitcoin to begin with. It's a perfect way to identify every criminal they want to find, isn't it? Every bitcoin transaction is recorded in a public record. Not a good choice for criminal activity. Coke encrusted cash is a much easier thing to deal with but I bet the NSA has been scanning dollar bills serial numbers from the time before they started embedding money with RFID.
all your base are belong to us. (CATS: You have no chance to survive make your time.)
Really? you think Bitcoin is on NSA's radar? Do you think that they have nothing better to do? They do have a charter that they are supposed to operate within, they don't get to do what ever they dream up. Sure, if what they are looking at is involved with BTC they'll get what they need, but overall i doubt that they care. besides, they probably understand BTC better than we do. There is a book called "The Puzzle Palace" that can give some insight into their mindset. Of course things have changed a bit since 9/11.