The director, commissioner, inspectors, and other employees of the division or department shall be allowed their necessary traveling expenses while in the discharge of their duties under this subchapter . [C97, §2477; S13, §2477; C24, 27, 31, 35, 39, § 1517; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §91.8 ; 81 Acts, ch 10, §10 ] 2023 Acts, ch 19, §1452, 1459 C2024, §10A.207