http://www.hc-sc.gc.ca/ahc-asc/pubs/_sites-lieux/insite/index-eng.php

  Reducing the Transmission of Blood-Borne Viral Infections & Other Injection Related Infections

     "Self-reports from users of the INSITE service and from users of SIS services in other countries indicate that needle sharing decreases with increased use of SISs. Mathematical modeling, based on assumptions about baseline rates of needle sharing, the risks of HIV transmission and other variables, generated very wide ranging estimates for the number of HIV cases that might have been prevented. The EAC were not convinced that these assumptions were entirely valid.

https://www.scientificamerican.com/article/massive-price-hike-for-lifesaving-opioid-overdose-antidote1/
Massive Price Hike for Lifesaving Opioid Overdose Antidote

Suddenly in demand, naloxone injector goes from $690 to $4,500

Should we follow the money?  Who would be profiting bigly from the increased use of naloxone?