Nathan Jones, nonresident scholar in drug policy and Mexico studies, breaks down the 2017 Drug Threat Assessment report published by the Drug Enforcement Agency. This report — which also identifies opioid use as one of the biggest drug-related problems facing the country — outlines how the legalization of marijuana has led to increased methamphetamine trafficking by Mexican drug cartels, says Jones. Listen here: http://bit.ly/2AohxwE.