I haven't even try buying drugs with the usage of Bitcoin because although it is a currency used to buy whatever the holder wants, there are still limitations for the usage of this currency. I admit it to myself that I will not be using Bitcoin for such thing as drugs because there are lot more important things that I need to spend and for me, drugs are just a waste of money and can ruin ones life. Also, if the international government will ever discover that Bitcoin was used for easy payment on buying drugs, surely they will destroy and stop the usage of Bitcoin to stop the negative actions done with the presence of it.