A security guard opens the gate at the Central Valley Meat Co., the California slaughterhouse shut down by federal regulators after they received video showing dairy cows being repeatedly shocked and shot before being slaughtered, on Tuesday, Aug. 21, 2012 in Hanford, Calif. Federal regulators are investigating whether beef from sick cows reached the human food supply. (AP Photo/Gosia Wozniacka)

Associated Press
A security guard opens the gate at the Central Valley Meat Co., the California slaughterhouse shut down by federal regulators after they received video showing dairy cows being repeatedly shocked and shot before being slaughtered, on Tuesday, Aug. 21, 2012 in Hanford, Calif. Federal regulators are investigating whether beef from sick cows reached the human food supply. (AP Photo/Gosia Wozniacka)
A security guard opens the gate at the Central Valley Meat Co., the California slaughterhouse shut down by federal regulators after they received video showing dairy cows being repeatedly shocked and shot before being slaughtered, on Tuesday, Aug. 21, 2012 in Hanford, Calif. Federal regulators are investigating whether beef from sick cows reached the human food supply. (AP Photo/Gosia Wozniacka)
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