The fourth study, produced by Débora Medeiros and Luís Fernando Tófoli, analyzes myths and facts that permeate the debate on drug policies. In the December 2018 essay, the authors seek scientific proof to assess the beliefs that comprise the prohibitionist paradigm, the ideology of the war on drugs, and other conventional wisdom. Based on this evidence, the authors demonstrate the negative impacts of these ideas and the need to review prohibitionist policies.