Okla. Stat. tit. 12, § 2702
If scientific, technical or other specialized knowledge will assist the trier of fact to understand the evidence or to determine a fact in issue, a witness qualified as an expert by knowledge, skill, experience, training or education may testify in the form of an opinion or otherwise, if:
Laws 1978, SB 276, c. 285, § 702, eff. October 1, 1978; Amended by Laws 2009, HB 1603, c. 228, § 18, eff. November 1, 2009 (repealed by Laws 2013, 1st Extr. Sess., SB 6, c. 15, § 1); Amended by Laws 2013, 1st Extr. Sess., SB 6, c. 15, § 2, as amended by Laws 2013, 1st Extr. Sess., SB 6, c. 15, § 3 (superseded document available).