Wyo. Stat. § 9-3-427: Other retirement plans prohibited.

The establishment of any annuity plan, limited service plan, pension or retirement system other than that provided by this article by any department, board, bureau or agency of the state or by any political subdivision of the state is prohibited, except this prohibition does not apply to the Wyoming state highway patrol, game and fish warden and criminal investigator retirement program. Any county memorial hospital or special hospital district that elects to participate in the state retirement system shall not otherwise participate in any other retirement system.