(r) Recurrent vetting (1) In general Not later than 180 days after the date of the enactment of this subsection, the Secretary shall develop and implement a plan to utilize the Federal Bureau of Investigation’s Rap Back Service in order to establish recurrent vetting capabilities for individuals holding valid transportation security cards under this section. (2) Exemption Individuals holding valid transportation security cards under this section who are subject to recurrent vetting under the plan to utilize the Rap Back Service referred to in paragraph (1) shall be exempt from any recurrent determinations or background checks under this section to which such individuals would otherwise be subject every five years in the absence of such utilization. . 515. Biometrics for TSA PreCheck (a) In general Not later than September 30, 2023, the Administrator of the Transportation Security Administration shall begin the utilization of biometrics to verify the identity of travelers enrolled in the Administration’s trusted traveler program, known as TSA PreCheck, at security screening checkpoints in a manner which— (1) protects the privacy and civil liberties of the traveling public