Amends GS 135-4 (concerning the Teachers' and State Employees' Retirement System) and GS 128-26 (concerning the Local Government Employees' Retirement System) by allowing a a member who has completed at least five years of membership service and who has been awarded the Advanced Law Enforcement Certificate to purchase up to four years' creditable service in one of those retirement systems. Sets out additional requirements for the purchase of service, including that it not be associated with any specific compensation or period of time. Sets out provisions for the calculation of the amount payable.