; and (B) whether there are any gaps in existing training. (e) Updates The Administrator shall ensure the program established under subsection (a) is updated as necessary to address changes in risk and terrorist methods and to close any gaps identified in the assessment under subsection (d). (f) Suspicious activity reporting (1) In general The Secretary shall maintain a national telephone number for an individual to use to report suspicious activity under this section to the Administration. (2) Procedures The Administrator shall establish procedures for the Administration— (A) to review and follow-up, as necessary, on each report received under paragraph (1); and (B) to share, as necessary and in accordance with law, the report with appropriate Federal, State, local, and tribal entities. (3) Rule of construction Nothing in this section may be construed to— (A) replace or affect in any way the use of 9–1–1 services in an emergency; or (B) replace or affect in any way the security training program requirements specified in sections 1408, 1517, and 1534 of the Implementing Recommendations of the 9/11 Commission Act of 2007 ( 6 U.S.C. 1137 , 1167, 1184). (g) Definition of frontline employee In this section, the term frontline employee includes— (1) an employee of a public transportation agency who is a transit vehicle driver or operator, dispatcher, maintenance and maintenance support employee, station attendant, customer service employee, security employee, or transit police, or any other employee who has direct contact with riders on a regular basis, and any other employee of a public transportation agency that the Administrator determines should receive security training under this section or that is receiving security training under other law