Okla. Stat. tit. 85A, § 313
If there is more than one arbitrator, the powers of an arbitrator shall be exercised by a majority of the arbitrators, but all of them shall conduct the hearing under Section 315 of this title.
Laws 2013, SB 1062, c. 208, § 134, eff. February 1, 2014; Amended by Laws 2019, HB 2367, c. 476, § 47, emerg. eff. May 28, 2019 (superseded document available).