Wyo. R. Prac. & P. 12.08
If, before the date set for hearing, application is made to the reviewing court for leave to present additional evidence, and it is shown to the satisfaction of the court the additional evidence is material, and good cause for failure to present it in the proceeding before the agency existed, the reviewing court, in contested cases, shall order the additional evidence to be taken before the agency upon those conditions determined by the reviewing court. The agency may adhere to, or modify, its findings and decision after receiving such additional evidence, and shall supplement the record to reflect the proceedings had and the decision made. Supplemental evidence may be taken by the reviewing court in cases involving fraud, or involving misconduct of some person engaged in the administration of the law affecting the decision. In all cases other than contested cases, additional material evidence may be presented to the reviewing court.
Wyo. R. Prac. & P. 12.08