(Use Unrelated to Enforcement) "Opponents of drug policy reform commonly argue that drug use would increase if health-based models were emphasized over drug law enforcement,14 but we are unaware of any research to support this position. In fact, a recent World Health Organization study demonstrated that international rates of drug use were unrelated to how vigorously drug laws were enforced, concluding that 'countries with stringent user-level illegal drug policies did not have lower levels of use than countries with liberal ones.'15"

Source

Wood, Evan; McKinnon, Moira; Strang, Robert; and Kendall, Perry R., " Improving community health and safety in Canada through evidence-based policies on illegal drugs," Open Medicine (Ottawa, Canada: 2012) Vol 6, No 1, p. 1.
http://www.openmedicine.ca/ar…