Aviation Security: TSA Is Taking Steps to Improve Expedited Screening Effectiveness, but Improvements in Screener Oversight Are Needed, GAO-16-707T: Published: Jun 7, 2016. Publicly Released: Jun 7, 2016.

“In 2015, TSA screened or oversaw the screening of more than 708 million passengers at more than 450 U.S airports. In carrying out the screening process, TSA is responsible for ensuring the security of civil aviation while also managing the efficient flow of passengers. TSA employs screening personnel, called TSOs, to carry out passenger and baggage screening operations. Each year, TSA tests TSO performance as part of its efforts to monitor the effectiveness of aviation security screening. In 2011, TSA began providing expedited screening procedures to selected passengers, intended to strengthen security and improve the passenger experience by shortening lines and wait times…”