Sure you can. Restrict illegality to use/possession outside of a treatment program. There already are many things pharmacists are not allowed to sell without a

Sure you can. Restrict illegality to use/possession outside of a treatment program. There already are many things pharmacists are not allowed to sell without a doctor's prescription, including strong opoids. You would probably not want this kind of prescription to be signable by just any MD though, but that's another story.