it is so unfortunate for the Bitcoin to be used for illegal activities. such as buying and selling in the blackmarket. but if the legalization of Marijuana in the US be impose,then this may bring some other side effects for the country. since if transactions are done through bitcoin, you no longer knew who you are transacting with. since theres no need to have personal information in sending or receiving money. what if the person you are transacting wont use Marijuana in a proper way. so how will the police trace that person right.