The U.S. Government Accountability Office was tasked to examine the performance and staffing strategy of the TSA Adjudication Center. This report addresses the extent to which: (a) TSA has measured performance for the Center and what the data show; (b) TSA offices have coordinated to meet the overall security threat assessment workload; and (c) TSA has addressed the potential risks posed by using a mix of government employees and contractors to adjudicate security threat assessments.
http://www.gao.gov/assets/660/656051.pdf