bTB or not bTB?

Why is bovine TB a policy issue at all? The round table discussion certainly got back to basics with this question. Is this disease still a threat to human health? If it is it shouldn't be coming from milk - if we can trust pasteurisation. But can we? And is it significant that TB testing subsidises some rural veterinary practices? Lots of questions. Lots of science. Not many answers at the moment.