Section 672.17 - Voluntary participants(a) Individuals not subject to the requirements of this part may participate voluntarily. To receive a certificate of completion as a voluntary participant, individuals must complete the PTSCTP curriculum within three (3) years of their enrollment. Voluntary participants are not required to complete recertification. FTA will not recertify voluntary participants.(b) If a voluntary participant has received a PTSCTP certificate of completion and is subsequently designated by an SSOA or rail transit agency as a PTSCTP participant, the individual will need to complete required recertification training within two (2) years of designation.