Back to solving the problem, here's one idea that I think is a step in the right direction: Legal, supervised, injection centers. "More people are seeking treatment, HIV transmission from needle sharing has dropped and fewer people are injecting drugs, according to a report which analyzed 15 years of drug data and was cited by the Vancouver Sun in a 2013 article."

http://www.foxnews.com/us/2016/02/22...n-ny-city.html