Thousands of guns used by Mexican cartels, as well as other gangs throughout Latin America, have been traced back to U.S. gun manufacturers. Journalist Ioan Grillo describes how the flow of guns to Mexico from the U.S. exacerbates the drug war and its accompanying forced displacement of people. Baroncelli and Grillo debate drug legalization and whether it can break up cartels that use American guns to maintain global drug distribution.  Cartels increase their profit margins by cutting their product with fentanyl and other lethal substances at the expense of people's lives.