Tennessee Code Title 7. Consolidated Governments and Local Governmental Functions and Entities § 7-86-125

(a) The board of directors of each district shall adopt comprehensive travel regulations applicable to all officers and employees of the district. The minimum regulations shall be the same as those of the appropriate county or municipality that created the district. Nothing in this subsection (a) shall prohibit a district from adopting a more stringent policy. However, the district may establish a mileage allowance for travel up to, but not in excess of, the business standard mileage rate established by the Internal Revenue Code (26 U.S.C.).

(b) If the appropriate county or municipality does not have comprehensive travel regulations as described in subsection (a), the board shall adopt travel regulations. Such regulations shall determine how expenses will be reimbursed and what expenses are reimbursable. A copy of such travel regulations shall be open for public inspection and kept on file in the district office.