After seven months of silence, the U.S. Department of Agriculture (USDA) confirmed the second U.S. case of mad cow disease on June 24, highlighting the need for more stringent regulatory protections of the nation's beef supply.
Seven months before the USDA announcement, government scientists ran a test that indicated that a U.S. cow was infected with mad cow disease. The result of this test was never publicly disclosed. According to the New York Times,