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Fourteen alleged members of "Los Zetas" drug cartel and seized weapons are presented to the press in Monterrey, Nuevo Leon state, Mexico on February 15, 2012. More than 40,000 people have been killed in rising drug-related violence in Mexico since December 2006, when President Felipe Calderon deployed soldiers and federal police to take on organized crime. AFP PHOTO/Julio Cesar AGUILAR (Photo credit should read Julio Cesar Aguilar/AFP/Getty Images)
Fourteen alleged members of "Los Zetas" drug cartel and seized weapons are presented to the press in Monterrey, Nuevo Leon state, Mexico on February 15, 2012. More than 40,000 people have been killed in rising drug-related violence in Mexico since December 2006, when President Felipe Calderon deployed soldiers and federal police to take on organized crime. AFP PHOTO/Julio Cesar AGUILAR (Photo credit should read Julio Cesar Aguilar/AFP/Getty Images)

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    Mexican drug cartels: One thing to know

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Mexican drug cartels: One thing to know

CNN's Polo Sandoval explains the one thing you need to know about Mexican drug cartels.

Mexican drug cartels: One thing to know

CNN's Polo Sandoval explains the one thing you need to know about Mexican drug cartels.