Violence by and against drug dealers causes havoc, from the streets of United States cities to source and transit countries including Afghanistan, Mexico, Honduras, and Colombia. About two-thirds of those arrested for violent crimes in the United States test positive for illicit drugs or have a history of substance abuse or dependence (U.S. ONDCP ADAM II Annual Report 2012), and we have no reason to assume that the United States is an anomaly in this regard (Parry et al. 2004). Tough the association between drug consumption and violent crime does not, by itself, demonstrate causality, the overlap is breath-taking.