Consumers can be assured that the U.S. beef supply is safe in the aftermath of USDA’s confirmation of the nation’s fourth case of BSE. The disease was detected in a dairy cow from central California - but the carcass was not slaughtered for human consumption or entered the food chain. Janet Riley with the American Meat Institute says as a result - it never presented a risk to the food supply or human health - and they hope consumers will take that fact to heart…