FILE - In this June 20, 2011, photo released by Mexico's Attorney General's office, police from the Federal Public Ministry looks at drums of precursor chemicals for methamphetamine that were seized in Queretaro, Mexico. Mexican drug cartels are flooding U.S. cities with cheap, extraordinarily pure methamphetamine made in factory-like "super labs” _ a surge in production that has all but negated the nation's long effort to curb meth production at home with tighter controls on key ingredients.(AP Photo/Attorney General's office, File)

Associated Press
FILE - In this June 20, 2011, photo released by Mexico's Attorney General's office, police from the Federal Public Ministry looks at drums of precursor chemicals for methamphetamine that were seized in Queretaro, Mexico. Mexican drug cartels are flooding U.S. cities with cheap, extraordinarily pure methamphetamine made in factory-like "super labs” _ a surge in production that has all but negated the nation's long effort to curb meth production at home with tighter controls on key ingredients.(AP Photo/Attorney General's office, File)
FILE - In this June 20, 2011, photo released by Mexico's Attorney General's office, police from the Federal Public Ministry looks at drums of precursor chemicals for methamphetamine that were seized in Queretaro, Mexico. Mexican drug cartels are flooding U.S. cities with cheap, extraordinarily pure methamphetamine made in factory-like "super labs” _ a surge in production that has all but negated the nation's long effort to curb meth production at home with tighter controls on key ingredients.(AP Photo/Attorney General's office, File)
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