The suit comes after the largest beef recall ever, involving a California meat packing plant using so-called "downer cows".

之前，发生了美国史上最大的牛肉召回事件，包括加利福尼亚肉制品包装公司使用所谓的“倒地牛” 。

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After the third US mad cow was found in 2006, the USDA cut testing from 300, 000 animals to only 40, 000 a year. (out of 37 million slaughtered) And only 5000 downer cows are tested out of the 1 million downer cows rendered into animal feed each year.

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Kerry called for all "downer" cows -- those unable to walk into the slaughterhouse -- to be tested and not allowed into the food supply until certified as disease-free, as some other countries have mandated.

CNN: Democrats criticize administration over mad cow