Okla. Stat. tit. 40, § 40-76: Night work

No person under the age of sixteen (16) years shall be employed

or permitted to work in any of the occupations set out in Section 71

of this title between the hours of seven o'clock p.m. and seven

o'clock a.m.; except, during the summer (June 1 through Labor Day)

and, if the employer is not covered by the Fair Labor Standards Act,

during the remainder of the year on days followed by a nonschool day

when the prohibited hours will be between the hours of nine o'clock

p.m. and seven o'clock a.m.

R.L. 1910, § 3733; Laws 1929, c. 35, p. 35, § 2; Laws 1955, p. 240,

§ 1; Laws 1976, c. 151, § 1; Laws 1991, c. 172, § 5, eff. Sept. 1,

1991; Laws 1993, c. 137, § 2, eff. Sept. 1, 1993.