; (B) a determination regarding whether the risk modified screening protocol was effective; and (C) if the Administrator determined that the protocol was effective, a plan for the deployment of the protocol at as many TSA passenger screening checkpoints as practicable. (6) Implementation In determining whether deployment of the protocol at a TSA passenger screening checkpoint at an airport is practicable, the Administrator shall consider— (A) the level of risk at the airport; (B) the available space at the airport; (C) passenger throughput levels at the airport; (D) the checkpoint configuration at the airport