"Government agencies have the authority to recall faulty products ranging from toys to tires and impose penalties if products aren’t pulled off the market, but when it comes to our food supply, industry calls the shots. The U.S. Department of Agriculture and U.S. Food and Drug Administration do not have the power to order mandatory recalls of contaminated food products other than infant formula, leaving it up to food producers instead to conduct voluntary recalls."
http://www.consumersunion.org/campaigns/notinmyfood/about.html