Black Hawk County Sheriff Tony Thompson left the Tyson pork processing plant in Waterloo, Iowa, in disgust. On April 10, after receiving complaints from workers and community members, he and local health officials inspected the facility, which is responsible for about 5 percent of total U.S. pork production, according to industry estimates. “We walked out of that plant tour knowing those complaints were valid,” says Thompson, who is also chair of the Black Hawk Emergency Management Commission. “They had a