Tennessee Code Title 8. Public Officers and Employees § 8-26-112

(a) In counties having a population of one hundred thousand (100,000) or more, according to the last federal census, any salaried county official who is paid from county funds and who holds office by election of the people, by election of the county legislative body, or by election of any other county board or commission, and any clerk or master appointed by a chancellor, shall be reimbursed from county funds for the actual expense which such county official, clerk or master may incur as an incident to holding such office. Such expenses include, but are not limited to, lodging while away from such person's official residence, and traveling expenses both within and without the county of such person's official residence. However, the county legislative body may by resolution determine what expenses will be reimbursable, and the county mayor will prescribe forms on which such expenses will be reported, and will examine such expense reports when submitted to determine if the expense is reimbursable, and if so forward the expense report to the proper disbursing officer for payment.

(b) In all other counties of the state, the county legislative body may by resolution elect to pay the expenses of elected county officials, and may promulgate rules of procedure as to how expenses will be reimbursed and determine what expenses are reimbursable. In such county so resolving, it will be the duty of the county mayor to prescribe forms on which expenses will be reported, and it is further made the county mayor's duty to examine such expense report to determine if all expenses so listed as reimbursable are legally reimbursable expenditures within the schedule as determined and announced by the county legislative body and, if such listed expenses are reimbursable, then to forward the expense report to the proper disbursing officer for payment.

(c) No expenses will be paid under this section which are now authorized and paid under any other law.