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More than 60 percent of the cartels' revenue -- $8.6 billion out of $13.8 billion in 2006 -- came from U.S. marijuana sales, according to the White House Office of National Drug Control Policy. Now, to stay competitive, Mexican traffickers are changing their business model to improve their product and streamline delivery. Well-organized Mexican cartels have also moved to increasingly cultivate marijuana on public lands in the United States, according to the National Drug Intelligence Center and local authorities. This strategy gives the Mexicans direct access to U.S. markets, avoids the risk of seizure at the border and reduces transportation costs. Unlike cocaine, which the traffickers must buy and transport from South America, driving up costs, marijuana has been especially lucrative for the cartels because they control the business all the way from clandestine fields in the Mexican mountains to the wholesale dealers in U.S. cities such as Washington. "It's pure profit," said Jorge Chabat, an expert on the drug trade at the Center for Research and Teaching in Economics in Mexico City.

The Gulf cartel has recently hung banners in Nuevo Laredo accusing Calderon's administration of protecting the less-openly bloody Sinaloa cartel, while cracking down on extremely violent rival drug gangs. While Sinaloa hit men have carried out massacres in the past, the Gulf and La Familia cartels frequently use the grizzliest methods imaginable to eliminate rivals and attack police and army patrols.