On Wednesday, Dec. 28, 2011, Mexican marines stand guard over barrels containing 120,000 kilograms (264,000 pounds) of methylamine, a precursor chemical for manufacturing meth, seized at the Pacific port of Lazaro Cardenas, Mexico, that were headed for Guatemala. The meth problem is spilling into other parts of Latin America, too, almost all of it bound for Guatemala. (AP Photo/SEMAR)
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