In a British Columbia Centre on Substance Use study, researchers found that public injection and syringe sharing decrease by 5.5% after overdose prevention sites were opened in the area.

Among users of Insite, North America’s first supervised injection site in Vancouver, involved in one study, 71% reported fewer public injections and 56% reported less unsafe needle disposal. The supervised injection site was also associated with reductions in public injecting, discarded needles, and other injection-related litter. There were no increases in drug trafficking, assaults, robberies, and there was a significant decline in vehicle break-ins.

Reference
i. Evidence Around Harm Reduction and Public Health-Based Drug Policies, Canadian Drug Policy Coalition