Tenn. Code § 8-3436
After the time mentioned in § 8-3452, the board shall certify to the commissioner of finance and administration and state treasurer in the case of any state employee paid by warrants on the state treasurer, or to the department, institution, commission, board or agency by which the salary of any state employee is paid, the proportion or per centum to be deducted from the compensation of each member and the commissioner of finance and administration, state treasurer, department, institution, board, agency of employer, as the case may be, shall cause to be deducted from the salary of each member on each and every payroll for each and every payroll period the proportion of the members' compensation so certified, but in no case shall any deduction be made from the compensation of a class B member or class C member who has attained his minimum service retirement age or period, if such member elected not to contribute. All sums deducted shall be transmitted to the state treasurer, and the state treasurer shall furnish the comptroller, the commissioner of finance and administration, and the board with a record of all such moneys. Provided further, that with the approval of the board, that persons who work under the supervision of the state, but whose compensation is paid from sources other than state funds by persons or organizations not a part of the state government may be granted membership in this system. Monthly contributions from members so accepted shall be paid directly to the system through the state treasurer.
Until such time as this section becomes effective as provided in § 8-3452, § 8-3436 of the Tennessee Code as enacted by chapter 6 of the Public Acts of 1957, prior to amendment, shall remain in full force and effect.
T.C.A. § 8-3436