Tenn. Code Ann. § 8-34-624

Any attorney general who was transferred from the state payroll to a full-time county law enforcement administration career criminal grant position and subsequently transferred directly back to the state payroll, may establish retirement credit for the period of service in the grant position; provided, that the member has remained in service as an attorney general with no break in continuous service longer than one (1) year. Such attorney general may establish retirement credit for such service rendered, upon a payment of the necessary back contributions and interest based on the salary such attorney general would have received had such attorney general remained on the state payroll as a full-time assistant district attorney general.