Members of the Los Zetas gang are arrested in Mexico City in 2007EPA / Corbis
From Time Magazine:
For a confessed drug cartel hood whose alias is "The Nut Job," Marco Vinicio Cobo is remarkably calm and plain-looking. Sitting in the blue-walled interrogation room of a Mexican army base, the chubby, goatee-bearded 30-year-old coolly describes his work for the Zetas, a feared paramilitary force responsible for thousands of brutal murders. And even when he details how his bosses kidnapped and chopped the head off a soldier, he appears relaxed and unemotional, as if he were discussing the weather. But despite the unsettling indifference of its tone, Cobo's confession — of which a video has been obtained by TIME — offers some extraordinary insights into how the cartels have grown into a formidable threat to the Mexican government, outwitting and outgunning the armed forces in great swathes of the country.
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My Comment: This article gives a good look at how the drug gangs work in Mexico. It is no surprise that the Mexican Army and the government have so much trouble in winning this war.