I don't have to, science has. Not all drugs are good, I never made such an assertion, but alcohol and cannabis both have benefits in moderation which have been proven. The way you keep people from using bad drugs is informing them, not a senseless law which has only made things a lot worse and people have every right to destroy their own bodies. You have no authority to prevent them. Also, no one would be "Getting the S bet out of them" if they were dealt within a business. We are free, and the only thing illegal are the laws that prohibit drugs.