ANNAPOLIS, Md. - During the anthrax mail attacks in 2001, Bill Paliscak, a gung-ho, hockey-playing postal investigator who had missed 3 days of work in 11 years, removed a filthy filter above a mail-sorting machine to preserve it as evidence. Anthrax-laden dust showered down on him. Skip to next paragraph David Scull for The New York Times Bill Paliscak cannot live at his home until an elevator is installed. Enlarge This Image Agence France-Presse Workers in October 2001 cleaned the Brentwood postal facility in Washington, where employees like Mr. Paliscak were exposed to anthrax. Four days later he began to...