WARNING!
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In 2008, Mexico refused a shipment of U.S. beef. The meat exceeded Mexico's regulatory upper limit for copper. The meat was returned to the United States -- where it was sold and eaten.
Contamination of meat by heavy metals, veterinary drugs and pesticides is a problem which the U.S. government has for the most part ignored. And while bacterial contaminants can be killed by cooking, chemical residues stay in the meat.
AlterNet reports:
“Sick dairy cows are given medications to help them recover, but if it appears an animal will die, it's often sold to a slaughterhouse as quickly as possible, in time to kill it before it dies.”