The ninth Latin America informal drug policy dialogue was devoted to "dilemmas in regulation of the cannabis market." The two-day dialogues were structured around seven sessions: (1) The Uruguayan proposal for cannabis regulation: dilemmas and challenges. (2) Current models of regulation: United States, Spain and the Netherlands. (3) The fine art of regulation: state monopoly vs. self-regulated market which works better and for whom? (4) Addressing cross-border differences and market mobility. (5) Tensions between cannabis regulation and international drug-control treaties: What options do governments have? (6) Cannabis reforms under way in Latin America. (7) Strategy and paths to reform: scenarios and next steps.