From the Document: "Mexico is a primary foreign producer and transit country for illicit drugs destined for the United States. Policymakers, including many in Congress, have been closely watching how the Coronavirus Disease 2019 (COVID-19) pandemic has affected drug flow patterns out of Mexico, including the flow of potent opioids and other illicit drugs. Any changes could affect the extent to which Mexico-based transnational criminal organizations, popularly described as 'cartels', pose a threat to U.S. national security. To date, U.S.-bound illicit drug supplies have persisted, despite early supply chain disruptions."
CRS Insight, IN11535
Congressional Research Service: https://crsreports.congress.gov/