I agree with Idaho as to prohibition, at least in general. The costs outweigh the curtailment almost every time and associated problems tend to become more intransigent.

I am not sure I see the value in criminalizing any substance in and of itself. Education, fraud reduction, etc. all have value.

While not interested in paying for it out of my tax dollars, I am of the mind that doctors should be able to prescribe pretty much whatever they wish that provides care for their patient. If that is a light dose of heroin to get a damaged addict up to normal and functional, I conceive of that more as a medical issue than a political one.