The beauty of the Shadow market will be the decentralizaion. There will be no "Dread Pirate Roberts" to catch.

All of the dark market prosecutions have been based on identifying and confiscating a server and arresting the admin of it. If they want to expend their resources tracking down a kid who bought a bag of weed, let them. That happens every day already. The SDT system is just the icing on the cake. It will allow those of us who are completely clean to handle the fiat with no link to the coins and what they may have been used for.