Okla. Stat. tit. 12, § 2403
Relevant evidence may be excluded if its probative value is substantially outweighed by the danger of unfair prejudice, confusion of the issues, misleading the jury, undue delay, needless presentation of cumulative evidence, or unfair and harmful surprise.
Laws 1978, SB 276, c. 285, § 403, eff. October 1, 1978.