people want to know, is the food supply safe? elizabeth cohn is here tonight with the latest. you spoke to this company, baker commodities, they have a plant in hanford, california, where a cow that was randomly selected tested positive for mad cow disease. what have you learned? here s what i learned, anderson. the way it works at this plant is they only have dead animals there. every so often they do random testings. they have hundreds of carcasses. they choose let s say about 60, and one of them turns out to have mad cow disease. and so what if they hadn t randomly found that animal? well, that animal would have been rendered into something. it might have been soap or chemicals or something you and i would never eat. something that wouldn t harm us, but it might have been rendered into feed for livestock. how dangerous is that if it had been rendered into feed that livestock had eaten and then people ate the livestock? here s why it should not have been a problem. th