Notwithstanding the restrictions contained in §§ 3-12C-504 and 3-12C-509 , a current contributing member with over five years of contributory service in the system may purchase nonqualified permissive service credit as defined in and pursuant to the provisions of § 415(n) of the Internal Revenue Code. Source: SL 2003, ch 94 , § 2; SL 2009, ch 21 , § 1; SL 2013, ch 20 , § 9; SDCL § 3-12-84.2 SL 2019, ch 22 , § 1.