The entire point is to get the crime and enforcement cost out of drugs. After legalization there may still be a black market but no where near what we have today and without the violence that is inherant in smuggling. We would save billions without the DEA. The cartels would collapse or else go legit. It would free up prison space for true criminals. No more hand slaps. Steal a car there's now room at the inn for you maggot. There would definitely need to be a way for addicts to get treatment/drugs and, since legal, that could fall under welfare. Something similar to the methadone treatment we do now or needle excange, etc. Since we claim to be the pillar of freedom it'd be nice if we were moving in that direction.