The Washington Post revealed on Wednesday that the United States Transportation Security Administration had inadvertently leaked closely guarded secrets related to airport passenger screening practices when it posted the TSA operating manual last spring. The 93-page document published on the web details procedures for screening passengers and checked baggage, such as technical settings used by X-ray machines and explosives detectors. It also identifies 12 countries whose passport holders are automatically subjected to added scrutiny and includes pictures of credentials used by members of the US Congress, CIA employees and federal air marshals, and it.