AC360 Thursday 8p

Are crews preparing to move to "Plan B" in the search for Flight 370? The latest tonight live on AC360.
April 25th, 2012
10:27 PM ET

KTH: Are tests for mad cow disease enough?

Only about 40,000 cattle are tested for mad cow disease in the U.S. each year. Anderson Cooper looks at the testing procedure.

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Filed under: Keeping Them Honest