Okla. Stat. tit. 12, § 1435

Evidence to consider by court - Limited discovery. A. In determining whether a legal action shall be dismissed under the Oklahoma Citizens Participation Act, the court shall consider the pleadings and supporting and opposing affidavits stating the facts on which the liability or defense is based. B. On a motion by a party or on the court's own motion and on a showing of good cause, the court may allow specified and limited discovery relevant to the motion to dismiss.