Transshipment Through Mexico
"As Mexican traffickers wrested control of the most valuable portions of the trafficking chain from the Colombians, Mexico itself has become by far the most important conduit for cocaine entering the United States. Today, some 200 mt of cocaine transits Central America and Mexico annually, bringing some US$6 billion to the regional 'cartels'. As a result, those who control the portions of the Mexican border through which the bulk of the drug passes have gained wealth and power comparable to that commanded by the Colombian cartels in their heyday. These groups command manpower and weaponry sufficient to challenge the state when threatened, including access to military arms and explosives."
UNODC, World Drug Report 2010 (United Nations Publication, Sales No. E.10.XI.13), p. 237.