Wyo. Stat. § 1-12-103
A party may compel the adverse party to testify orally or by deposition as any other witness, and no person is disqualified as a witness in any action, civil or criminal, because of his interest in the same as a party or otherwise. Every person is a competent witness except as otherwise provided by law, but his interest in the action may be shown to affect the credibility of the witness. Any party of record in a civil action, or any person for whose immediate benefit the action is prosecuted or defended, or his assignor, officer, agent or employee or if a county or city is a party any officer of the county or city, may be examined upon the trial of any action as if under cross-examination at the instance of the adverse party and may be compelled to testify subject to the same rules for examination as any other witness. The party calling for the examination is not concluded thereby and may rebut the evidence given by counter or impeaching testimony.
W.S. 1-12-103