Benn;It would strike me that the optimal path to legalization would be similar to autos or fire arms. Take a course, learn about dosing, sterility, consequences of infection. See how few doses results in addiction, and watch some videos of some famous people withdrawing (Angelie Jolie). After you get your certificate buy it at the narcotic store with naloxone, advice to not use alone, dosing suggestions on the ampule with a clean needle.. Brochures for addiction services at the till, all profits to addiction services, all the policing money to addiction services. A different course for each class of drugs, one for ketamine, one for cocaine, etc. Less death, less infection, no introduction to criminals, no money to  criminals to buy guns. Whats the downside? Are prohibitionists afraid they won't be able to resist the allure to start? If so they need to watch someone in withdrawal.