In this June 20, 2011, photo released by Mexico's Attorney General's office, police investigators look at drums of precursor chemicals for methamphetamine that were seized in Queretaro, Mexico. Mexican authorities have made two major busts in as many months in the quiet central state of Queretaro. In one case, they seized nearly 500 tons (450 metric tons) of precursor chemicals. Another netted 3.4 tons (3.1 metric tons) of pure meth, which at $15,000 a pound would have a street value of more than $100 million. Mexico's most powerful drug cartel appears to be expanding methamphetamine production on a massive scale, filling a gap left by the breakdown of a rival gang that was once the top trafficker of the synthetic drug. (AP Photo/Attorney General's office)

Associated Press
In this June 20, 2011, photo released by Mexico's Attorney General's office, police investigators look at drums of precursor chemicals for methamphetamine that were seized in Queretaro, Mexico. Mexican authorities have made two major busts in as many months in the quiet central state of Queretaro. In one case, they seized nearly 500 tons (450 metric tons) of precursor chemicals. Another netted 3.4 tons (3.1 metric tons) of pure meth, which at $15,000 a pound would have a street value of more than $100 million. Mexico's most powerful drug cartel appears to be expanding methamphetamine production on a massive scale, filling a gap left by the breakdown of a rival gang that was once the top trafficker of the synthetic drug.  (AP Photo/Attorney General's office)
In this June 20, 2011, photo released by Mexico's Attorney General's office, police investigators look at drums of precursor chemicals for methamphetamine that were seized in Queretaro, Mexico. Mexican authorities have made two major busts in as many months in the quiet central state of Queretaro. In one case, they seized nearly 500 tons (450 metric tons) of precursor chemicals. Another netted 3.4 tons (3.1 metric tons) of pure meth, which at $15,000 a pound would have a street value of more than $100 million. Mexico's most powerful drug cartel appears to be expanding methamphetamine production on a massive scale, filling a gap left by the breakdown of a rival gang that was once the top trafficker of the synthetic drug. (AP Photo/Attorney General's office)
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