Okla. Stat. tit. 70, § 70-17-104: Credit for years of service — Prior service credits

A. The Board of Trustees of the Teachers’ Retirement System of

Oklahoma shall fix and determine by appropriate rules and

regulations how much service in any year is equivalent to one (1)

year of service, but in no case shall more than one (1) year of

service be creditable for all services in one (1) school year.

Service rendered for a regular school year shall be equivalent to

one (1) year of service.

B. If a member who has previously withdrawn service returns to

service in Oklahoma and completes one (1) year of membership service

credit, the member may reestablish prior service credit by

redepositing the amount formerly withdrawn, with the interest at ten

percent (10%) per annum. No member shall be permitted to redeposit

prior service more than one time.

C. The Board of Trustees may adopt such other rules and

regulations to verify, process, and credit the service herein

claimed.