"In July 2009, NIOSH received an HHE request from the American Federation of Government Employees. The union was concerned about respiratory protection for federal immigration and customs agency employees during the pH1N1 pandemic. NIOSH investigators reviewed the agency's written respiratory protection procedures, observed a respirator fit-testing session for employees at agency headquarters, and surveyed employees nationwide about respiratory protection practices. We found that the agency's respiratory protection policy, the respirator medical evaluation questionnaire, the qualitative fit-testing protocol, and the slide presentation serving as training for fit testers were comprehensive. The quality of the observed respirator fit-testing ...