That's the same as saying you're in favor of prohibition, Axe. If a person has to get a doctor's prescription for meth or crack cocaine, he or she will just turn to the black market. No doctor is going to prescribe such dangerous substances to a patient, unless you want to outlaw the Hypocratic Oath in order to legalize irresponsibility.
roscoe: ...By an unlicensed Doctor Feelgood working the sidewalk?
Is that who you would choose as a physician?
We have doctors now afraid to prescribe legal medications to their patients, because FedGov is breathing down their necks and looking over their shoulders for an excuse to shut them down. Forbidding people from taking medicine that could help them, in the name of what amounts to "stopping people from having non-State-approved fun", is nothing short of torture. Torturing one's own citizens is the hallmark of banana republics and totalitarian dystopias.
roscoe: Libertarian doctrine doesn't allow...
There is no such thing as libertarian "doctrine". It has a foundational principle, that precluding the initiation of force and fraud. That's it. In my view, moving towards honor of that principle is a good thing. Moving away from honoring the principle is not.
There are two important things we as a nation must accomplish if we're to turn away from the abyss that draws ever closer as we continue the failing big-gubmint policies of the 20th century. The first of these is reclaiming education from the social engineers. The public schools must be reformed or eliminated--at the very least control of them must be wrenched from FedGov and the NEA union and put at a local level.
And the Federal War on (some) drugs must end. Any government policy that results in its murder of innocent citizens and destruction of their property and lives, cannot be a good. The means pollute the ends.