It's hard to guess at how fare LEO are in "taking down" the site.I have worked with Police as part of my job involving compliance i.e anti money laundering and quite a number of senior officers had never even heard of the Bitcoin let alone Silk Road itself.I also think as far as narcotics go Silk Road is a very small slice of the number out there. The difference being it is far easier to raid a warehouse full of coke than it is to locate the anonymously purchased and maintained servers of SR.A lot of the problems to do with controlled drugs (and consequently the reasons for public pressure on the Police) are tied up with the violence associated with drug dealing, not the drugs themselves.As such my own opinion is that in reality the LEO take a pragmatic approach to Silk Road - just as they do to anyone who consumes clean amounts of drugs in the privacy of their own home. Of course they know it goes on and they'll stop it where they can but there's not a whole lot to be done about it.Of course we shouldn't be naive and for our own safety must assume that LEO are constantly analysing our internet traffic and could knock on the door any time!V.