OIRA met with the North American National Casing Association on July 12 over the prohibition of specified-risk material for human food and the requirements for disposition of non-ambulatory cattle. Specified-risk material is the part of the cow most likely to transmit the mad cow disease prion. Currently regulation prohibits the use of specified-risk material in meat products. However, several loopholes to the regulation exist. Non-ambulatory cattle are essentially cattle that appear to be ill (i.e. they can't walk). Most of the cows that test positive for mad cow disease have been non-ambulatory. Read more on mad cow disease.