This document summarizes research on the Dutch approach to cannabis policy, known as "de facto legalization". Key points include: - During the first decade after policy change in 1976, cannabis use prevalence did not increase, but sharply rose in the second decade due to commercialization of coffeeshops. - The Dutch system maintains high cannabis prices through prohibition on growers/traffickers while allowing sale to users, unlike potential US legalization with aggressive marketing and minimal price controls. - Experts note the Dutch policy was a product of addressing the heroin threat in the 1970s but the policy window has since closed, with unintended consequences like street dealing and production shifting elsewhere.