Okla. Stat. tit. 47, § 6-306
No employer shall permit a person to operate a motor vehicle under his control unless the person has a valid license for the class of vehicle being operated.
Laws 1961, HB 556, p. 352, § 6-306, eff. September 1, 1961; Amended by Laws 1990, HB 1989, c. 219, § 43, eff. January 1, 1991.