Wyo. Stat. Ann. § 11-39-102

In any nuisance action or proceeding against a feedlot brought by or on behalf of a person whose date of ownership of realty is subsequent to the established date of operation of that feedlot, proof of compliance with W.S. 11-39-103 is an absolute defense, if the conditions or circumstances alleged to constitute a nuisance are subject to regulatory jurisdiction by political subdivisions or related to the activities of the department of environmental quality.