He he. It's hidden in all 3 questions.
1. No FDR New Deal commerce clause, and WoD goes back to the states.
2. Ron Paul would end the federal WoD and send it back to the states.
3. No constitutional justification for a federal WoD exists. 10th Amendment says it belongs to the states.
Sorry, but there is constitutional authority for regulation of the nation's international trade, which is where the vast bulk of our opiates and cocaine come from. Marijuana and hash I'm less sure about.
I agree with you domestic marijuana growth, if it doesn't cross state lines, should be a state matter. But how many California growers sell interstate? I'd be willing to bet that more than 90% of them do. There is the Commerce Clause, plain and simple, and shorn of anti-10th Amendment liberal National Greatness folderol.
Oh, and Wm. F. Buckley is considered Old Right: he was conservative when confessing to conservatism in any of its forms would get you spat at by people confident you couldn't do anything about it.
It isn't intrinsic to the definition of an Old Right conservative that that the person so described should carry a number of psychic scars, but it's a good practical litmus test. Old Rightists were getting kicked around, abused, and vilified all through the 50's and 60's when NeoCons were coasting along comfortably, basking in the lap of Big-L Liberalism. They never had a bad day in the 50's and 60's, at least not until KGB Active Measures and their case officers turned their attention to fomenting opposition to the Vietnamese War.