cost, operational efficiency, and security effectiveness of requiring all employees to present for inspection at every access point between non-secured areas and secured areas of airports, and of deploying some or all of the following screening measures and technologies: (1) A secure door utilizing card and pin entry or biometric technology. (2) Surveillance video recording capable of storing video data for at least 30 days. (3) Advanced screening technologies, including at least 1 of the following: (A) Magnetometer (walk-through or hand-held). (B) Explosives detection canines. (C) Explosives trace detection swabbing. (D) Advanced imaging technology. (E) X-ray bag screening technology. (4) The TSA's Advanced Threat Local Allocation Strategy (commonly known as ATLAS ). (c) Contents To the extent practicable, the study under subsection (a) shall include the following: (1) Costs associated with establishing an operational minimum number of employee entry and exit points. (2) A comparison of estimated costs and security effectiveness associated with implementing the security features specified in paragraphs (1), (2), (3), and (4) of subsection (b) based on information on the experiences from those category I, II, III, IV, and X airports that have already implemented or piloted enhanced employee inspection measures at access points between non-secured areas and secured areas of airports. (d) GAO review Not later than 90 days after the date of receipt of the study under subsection (a), the Comptroller General of the United States shall— (1) review the study to assess the quality and reliability of the study