Tenn. Code § 4-3-1008
The department of finance and administration, with the approval of the governor, has the power and is required to prepare uniform rules and regulations for the payment of travel expenses for officers and employees of all state departments, institutions and agencies. It is the legislative intent that such rules and regulations provide that an employee under normal circumstances shall be responsible for bearing travel expenses for no more than thirty (30) days from the date of filing a claim, subject to an audit of the claim as required. The commissioner is further authorized to prepare special regulations when the commissioner determines that special circumstances necessitate them. Proposed uniform rules and regulations and proposed special regulations shall become effective upon approval by the attorney general and reporter. Prior to filing with the attorney general and reporter, the commissioner shall submit the proposed uniform rules and regulations and proposed special regulations to the comptroller of the treasury for comment.
T.C.A. § 4-3-1008