There is no such thing as "a safe supply of drugs". Whether the street drugs are produced in a quality-controlled way or not, it is well-known that use of the substances has negative outcomes in health and occupational functioning.

Direct sale of street narcotics would only be another harm reduction practice, similar to "safe use sites". But no harm reduction practice makes the harm "safe".

The political double-speak around this is very similar to "clean coal"; it implies a strong position ("coal is clean") while offering an escape hatch if challenged ("coal pollution mitigation, otherwise known as clean coal, reduces greenhouse emissions when coal is used as a fuel"). Similarly as there is no "clean coal" in reality, there is no "safe supply of drugs".

When we take deceiving loaded words like "safe" out of the equation, it becomes harder to argue against substance control, even if seen as prohibition. While it is evident that street drug crisis in the US has been mishandled, if restricting the access of these substances (or "prohibition") was done correctly, it would benefit society. Particularly, the prohibition would benefit society more if it was not mainly enforced through criminalization of street drugs, but instead through teaching, rehabilitation, and prevention.

In contrast, "safe" drug harm is an oxymoron. And it's very ineffective to even discuss anything on a double-speak premise. We should instead focus on fixing the root problem of drug use, rather than be distracted by harm reduction, especially when it's been politicized so much.