Today, images of cartels, security agents donning face coverings, graphs depicting egregious murder rates, and military guards at US border crossings influence the world's perception of Mexico. Mexico's so-called drug war, as generally conceived by journalists and academics, was the product of recent cartel turf wars, the end of the PRI's single party rule in 2000, and enhanced US border security measures post-9/11. These explanations are compelling, but they overlook state actions beginning in the 1970s that set the foundation for drug violence over the longer term.In _Policing on Drugs_, Aileen Teague chronicles a largely ignored but critical prehistory of intensified bilateral antidrug efforts by exploring their origins and inherent contradictions in Mexico. Beginning in the 1960s, US leaders externalized their aggressive domestic drug control practices by forcing junior partners such as Mexico into adopting their policies. Leaders on both sides of the border situated counternarcotics within a larger paradigm of militarized policing, which increased the power and influence of the military and aggressive counternarcotics in both countries. However, different security imperatives motivated US and Mexican agents, complicating enforcement in Mexico. Between 1969 and 2000, Mexico's embrace of America's punitive antidrug policies strengthened the coercive capacities of the Mexican state, exacerbated crime, and were so ineffective in an era of open trade blocs that they hastened the expansion of the drug trade.Drawing on such sources as records from the Drug Enforcement Administration (DEA), the US State Department, interviews with key officials, accounts from Mexican journalists, and rarely seen Mexican intelligence reports, Teague relates the war on drugs as a transnational story with deep historical roots in US and Mexican conceptions of policing and security. The negative impacts of US-led counternarcotics policies in Mexico can be attributed to the complex relationship between the United States' and Mexico's shared approach to the drug war--with critical implications for present-day relations.