Wyo. Stat. § 30-2-105: Alcohol or controlled substances and intoxication by either prohibited.

No alcohol or a controlled substance as defined in W.S. 35-7-1014 through 35-7-1022 except a controlled substance in schedule V not requiring a prescription or as prescribed by W.S. 35-7-1030 shall be taken into or permitted within any mine, excavation, pit or quarry, or mill or processing plant. No person believed to be under the influence of alcohol or a controlled substance as defined in W.S. 35-7-1014 through 35-7-1022 except a controlled substance in schedule V not requiring a prescription or as prescribed by W.S. 35-7-1030 shall be allowed to enter or remain in or around any mine, excavation, pit, quarry, or mill or processing plant.