Agents try to stop flow of drug money into Mexico

Stashing cash in spare tires, engine transmissions and truckloads of baby diapers, couriers for Mexican drug cartels are moving tens of billions of dollars south across the border each year. U.S. border and customs agents at crossings such as this one in Laredo, Tex., inspect vehicles for drug money in an effort to catch the bulk cash before it makes it into Mexico.

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