http://www.seattletimes.com/seattle-news/health/is-vancouvers-safe-drug-use-site-a-good-model-for-seattle/
"Although research appears to bear that out, many of the studies that attest to Insite’s success are small and limited to the years after the center opened. For instance, a 2011 study published in the journal The Lancet found a 35 percent reduction in overdose deaths in the blocks surrounding Insite, versus 9 percent in the rest of Vancouver.

But that often-cited study looked only at the period two years before and two years after the center opened, not the ensuing decade."

http://www.seattletimes.com/seattle-news/health/is-vancouvers-safe-drug-use-site-a-good-model-for-seattle/       

"Although Insite is paired with a drug-treatment center, called Onsite, Berner and other critics point out that completion rates are low. Of the 6,500 people who visited Insite last year, 464 were referred to Onsite’s detox center. Of those, 252 finished treatment."