The director or commissioner, as applicable, may issue subpoenas, administer oaths, and take testimony in all matters relating to the duties required of the director or commissioner under this subchapter . Witnesses subpoenaed and testifying before the director or commissioner shall be paid the same fees as witnesses under section 622.69 , payment to be made out of the funds appropriated to the department or division, as applicable. [C97, §2471; S13, §2471; C24, 27, 31, 35, 39, § 1519; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §91.10 ] 83 Acts, ch 186, §10041, 10201 ; 99 Acts, ch 68, §16 ; 2023 Acts, ch 19, §1454, 1459 C2024, §10A.209