"In summary, we documented significant reductions in the number of IDUs injecting in public, publicly discarded syringes and injection-related litter after the opening of the medically supervised safer injecting facility. These reductions appeared to be independent of several potential confounders, and our findings were supported by external data sources. Although the overall health impacts of the facility will take several years to evaluate, the findings from this study should be valuable to other cities that are contemplating similar evaluations and should have substantial relevance to many urban areas where public injection drug use has been associated with substantial public health risks and adverse community impacts."

Source

Wood, Evan, Thomas Kerr, Will Small, Kathy Li, David C. Marsh, Julio S.G. Montaner & Mark W. Tyndall, "Changes in Public Order After the Opening of a Medically Supervised Safer Injecting Facility for Illicit Injection Drug Users," Canadian Medical Association Journal, Vol. 171, No. 7, Sept. 28, 2004, p. 734.