Okla. Stat. tit. 70, § 18-113.4
Beginning with the 1997-98 school year, the penalties for exceeding class size limitations established in Sections 18-113.1, 18-113.2 and 18-113.3 of this title shall not apply if the class size limitations, as set forth in said sections, are exceeded beginning after the first nine (9) weeks of the school year. If the class size limitations are exceeded during the first nine (9) weeks, the penalties shall apply. For the purposes of calculating class size penalties established in Sections 18-113.1, 18-113.2 and 18-113.3 of this title, school districts shall use only the full-time-equivalency of the instructional staff who are under contract to work the full school year in question.
Laws 1996, c. 215, § 2, eff. July 1, 1996; Amended by Laws 1997, c. 355, § 6, eff. July 1, 1997 (superseded document available).