Okla. Stat. tit. 57, § 354
Upon the commitment to imprisonment of any prisoner under the provisions of Section 1 hereof, the Pardon and Parole Board shall cause a continuing study to be made of the prisoner. When the prisoner has served the minimum sentence imposed, or as soon thereafter as he or she can be heard, the Pardon and Parole Board shall hear the prisoner's application for parole, and shall make such recommendation to the Governor as, in its discretion, the public interest requires. Nothing herein contained shall be construed to prevent a hearing by the Pardon and Parole Board before the minimum term has been served.
Laws 1963, SB 153, c. 78, § 2, emerg. eff. May 21, 1963.