Let me clear do you talking to a person when you say STAFF or a thing STUFF. However, If you are talking to a thing, Nope. As far as I know I never used Bitcoin to buy  illegal stuffs because its unethical to do it and it can be a reason to destroy the image of Bitcoin in the world because as I know one of the reason why bitcoin banned by other country because it can be a tool to do some illegal activities which is not good.