The first confirmed case of mad cow disease in the U.S. in six years has shown up in California. Officials are still investigating how the dairy cow contracted the disease. The government is stressing there is no threat to human health because no meat from the animal was ever headed for the food supply. The cow was already dead and since it was a dairy cow, the infected animal does not pose a health hazard according to the government. Scientists say milk does not transmit the disease. It only hurts humans when an infected animal’s meat is eaten.