"We don’t know what the risk [of CWD transmitting to humans] is, but I would never tell you it’s zero. I’m not going to tell you it’s going to happen tomorrow, but at the same time, having been through BSE [bovine spongiform encephalopathy, or 'mad cow'] and remembering how all those people provided all those assurances only to be proven wrong 10 years later, I worry about it."