not sure how does that work, if for example the US police tries to catch junkies
they get an order from Brazil and they don't have jurisdiction over there, how do they deal with it?
They probably restrict shipping to the US. I do remember an article about a bust in Australia a while back, but now I can't find it.
That bust was by the Aussies, but it didn't have much to do with SilkRoad. He was selling drugs offline, and they learned he sold on SR as well.
Ah, ok. We do know there were undercover cops on Silkroad, though, because one of them sold DPR hitman services
Although, apparently vendor accounts cost a lot of money and were throttled, so it wouldn't be a piece of cake to pose as a legitimate vendor.