You really cannot stop illicit drug use. A hard approach to prohibition not only makes people less safe, it’s a massive waste of spending. On just a pragmatic level- Fentanyl and analogues are by weight hundreds of times more potent than morphine. How do you even effectively stop that from getting across borders? Silk Road provided a brief counterpoint, and ideally wouldn’t have had to exist. The ideals it represented were more broad- for drug regulations/spending that focus on safety, and respect individual rights / bodily autonomy (ofc limited to not harming or endangering others).