There's a Long, comprehensive, and practical article on U.S. drug policy and how to reform it.
It sounds good. I don't know any of the practical details (I've never taken illegal drugs, nor have I ever smoked, although I have a few glasses of beer or wine every week), but it sounds reasonable. It'll be generations (or never) before it flies though, likely. There's too much ideology invested in the current policy, and reasonable policies are very hard to sell to simple minds (such as those who are recruited into fundamentalist churches). To those minds, simple rules make sense, nuance, balance and tradeoffs between values complicate life too much.