Tenn. Code Ann. § 63-12-109

It is unlawful for the board or any member thereof, in any manner whatsoever or for any purpose, to charge or obligate the state for the payment of any money, and the board shall look alone to the revenue derived from the operation of this chapter for the compensation designated in § 63-12-108. If the revenue is not sufficient to pay each member in full, together with the necessary expenses of the board, then the amount available shall be prorated among the members. But if there should be a greater revenue derived than shall be required to pay the compensation and expenses, including, but not limited to, the administrative and personnel expenses deemed necessary in the discretion of the board to conduct inspections and issue licenses, permits and certificates as provided by this chapter, directed, any surplus shall be paid to the state treasurer, who shall receipt the board for the amount so received and shall account for the money as for other state revenue.