Tennessee Code Title 2. Elections § 2-9-110

(a) The county election commission, with the approval of the coordinator of elections and the state election commission, may provide for the use of voting machines which do not meet the requirements of this title except under this section.

(b) Machines and procedure for such use shall provide as much protection for the purity of the ballot and against election fraud as do voting machines which otherwise meet the requirements of this title.

(c) The use of voting machines in compliance with this section and the rules of the coordinator of elections shall be as valid for all purposes in an election as if the machines had otherwise met the requirements of this title for voting machines.