The Humane Society of the U.S. has, for years, been trying to frighten people away from consuming meat, milk and eggs -- but its recent testimony before a congressional committee reached a new low when the HSUS president, Wayne Pacelle, made the unsupported claim that pigs could be harboring the infamous and deadly British ‘mad cow” disease. Swine veterinarians quickly pointed out that “mad cow,” or bovine spongiform encephalopathy, has never occurred naturally in swine. At the height of the British “mad cow” epidemic, both swine and cattle were exposed to the tissues from thousands of infected cattle and the...