How do you sell marijuana legally?

the only way to sell pot "legally" is through ownership of a medicinal despencery in one of the 14 states that has legalized the use of marijuana for medicinal purposes. However in some of the states that have legalized medicinal marijuana, the penalty for possesion has been reduced to misdemener charge, however in larger amounts with paraphernelia i.e. a scale and small plastic bags, the charge is much worse depending on the state you're in.

all in all, unless you own a dispencery, be ready to face charges if you're ever caught dealing.