:::筛查效果.TSA调查办公室和美国国土安全部办公室经常进行秘密行动以测试机场筛查流程的有效性。A report by the found that TSA officials had collaborated with (CAS) at旧金山国际机场to alert screeners to undercover tests.From August 2003 until May 2004, precise descriptions of the undercover personnel wer