> it makes on the face of it no sense that i.e. needle exchange programs would lead to more drug overdoses. I don't agree that it makes 'no sense' but as I sai

> it makes on the face of it no sense that i.e. needle exchange programs would lead to more drug overdoses. I don't agree that it makes 'no sense' but as I said in my original comment - there are plenty of confounders. Thank you for listing some of them.