"Critics of this intervention, such as drug prevention advocacy organisations, Drug Free Australia and Real Women of Canada point to the most rigorous evaluations, those of Sydney and Vancouver.Two of the centers, in Sydney, Australia and Vancouver, British Columbia, Canada cost $2.7 million and $3 million per annum to operate respectively, yet Canadian mathematical modeling, where there was caution about validity, indicated just one life saved from fatal overdose per annum for Vancouver, while the Drug Free Australia analysis demonstrates the Sydney facility statistically takes more than a year to save one life.