It WORKED THEN.
What are you thinking "Worked" then? Free access to drugs the vast majority of people had no experience or understanding of? No, that didn't "Work", it was simply a logistical problem. Till a large enough segment of a population can produce a large enough demand to produce a large enough supply, drug addiction gets starved from lack of access.
You provide large enough access to a large enough supply of drugs, and you will find out that it doesn't "work" at all.
Personally, I think that all drug access should be available.
One caveat. No services, no healthcare, no housing and no food. And isolation in mini areas.
If sallies or some other private agency wants to minister to them on the agencies terms, have at them.
But nothing, absolutely nothing from the citizens taxes.