>Solution: Just make every kind of drug legal to produce, but regulate the purity. Be very explicit about the dangers. The only thing prohibition does is make drug consumption and production dangerous and needlessly expensive.

Absolutely. As is made pretty obvious here[0][1].

[0] https://www.nytimes.com/2023/01/07/health/fentanyl-xylazine-...

[1] Archive link: https://archive.is/Sv27y