No officer, agent, servant, or employee of any such company, who appears and testifies before the department of transportation under this chapter or chapter 5 of this title or in any civil or criminal proceedings instituted by the department of transportation under this chapter or chapter 5 of this title, shall be liable to indictment or presentment for any violation of this chapter or chapter 5 of this title about which such person so testifies.
Officers or employees testifying exempt from indictment
Tenn. Code Ann. § 65-3-116, under General Provisions.
Tenn. Code Ann. § 65-3-116