I can tell you what I've said on here previously.I don't work directly with the Police any more but my bank has to file reports for suspicious account activities and as such we occasionally liaise with specialists from drug task forces and financial crimes units.The last two senior officers I spoke to seemed unaware of the concept of Bitcoins altogether. I am sure they're aware of Silk Road vicariously but considering the difficulty of mastering even the basic concepts of using it, I doubt we have much to worry about.I know this because in my experience the Police seem to have only the most basic degree of computer literacy at best. Any complex work involving digital forensics and so on seems to be farmed out to the private sector on a regular basis rather than be managed in house, mainly I think because it's cheaper to do that on an ad hoc basis than train and maintain the knowledge of your own officers.Admittedly I don't speak to people in SOCA or live in a major Metropolitan area so there may well be more tech savvy officers out there but the degree of cunning and resourcefulness required to detect someone's activities on here is huge, provided a person takes the reasonable precaution of encrypting their machine, only using the Tor browser and GPG to arrange purchases, obtaining Bitcoins anonymously and so on.I have also read a little of the literature related to AML (Anti Money Laundering) procedures as supplied to the Police and have yet to find any reference to Onion Routing, P2P Currencies or the Silk Road.Of course we shouldn't be complacent - we have the upper hand for now but we're aware of the weaknesses and should always make sure we're vigilant against potential visits by the Police. V.