Aviation Security: TSA Coordinates with Stakeholders on Changes to Screening Rules but Could Clarify Its Review Processes and Better Measure Effectiveness, Report to Congressional Committees [open pdf - 1MB]
From the Highlights: "The TSA Modernization Act includes a provision for GAO [Government Accountability Office] to review the current oversight mechanisms and effectiveness of Silent Partner and Quiet Skies. This report examines the extent to which TSA has (1) coordinated with relevant DHS and TSA stakeholders to review passenger screening rules; and (2) assessed the effectiveness of these rules. GAO analyzed TSA documents, including standard operating procedures, and interviewed senior DHS and TSA officials involved in managing and overseeing the programs."
Government Accountability Office: http://www.gao.gov/