Okla. Stat. tit. 70, § 6-104.1
After exhausting sick leave and extended leave pursuant to Section 6-104 and 6-104.5 of Title 70 of the Oklahoma Statutes, a full-time teacher who, with the proper approval of the district board of education, takes not more than ninety (90) school days of leave without pay to care for the teacher's child during the first year of the child's life, shall receive full credit for the days on leave with out pay as though the teacher had been on leave with pay for purposes of computing experience for the minimum teacher salary schedule. A teacher on leave without pay pursuant to this section who pays the actuarial cost, as determined by the Board of Trustees of the Teachers' Retirement System, shall have the period during which such leave without pay is taken, counted toward retirement service credit as though the teacher had been on leave with pay. The teacher shall notify their employer and the System in writing within thirty (30) days from the date he or she returns to service that they will pay such actuarial cost. The teacher shall have up to twelve (12) months form the date he or she returns to service to pay such actuarial cost.
Laws 1998, SB 1033, c. 402, § 1, emerg. eff. July 1, 1998.