020-2 Wyo. Code R. § 2-10
(a) Subpoenas, requiring the attendance of witnesses from any place in the State of Wyoming at any designated place or hearing, or for the production of books, papers or other documents, or a subpoena duces tecum, may be issued by the Council upon application of any party to the proceeding or upon the motion of the Council at any time after the date the application for a permit is filed.
(b) Subpoenas for the production of books, papers or other documents, unless directed by the Council upon its own motion, will issue only upon application in writing, and such application shall set forth the books, papers or other documents sought with a showing that they will be of service in the decision of the Council.
(c) Costs of service of subpoenas shall be paid by the parties requesting the service, or by the Office if requested by the Council.
020-2 Wyo. Code R. § 2-10