C.R.S. § 33-2-105.5

(1) The general assembly determines and declares that pursuant to the tenth amendment of the United States constitution, the state of Colorado has primacy over affairs that are of statewide concern and that matters concerning the environment, including the introduction or reintroduction of species that are currently not found or no longer found in this state is a statewide concern and should be conducted by the state through specific legislation. Reintroduction drives enormous land use questions and impacts property and water rights throughout Colorado. (2) Before any species may be introduced or reintroduced into this state through action by any state or local government entity, the general assembly shall act by bill to specifically name such species and to specify the manner of introduction or reintroduction. The species to be introduced or reintroduced shall be: (a) Not, or no longer, found in this state; and (b) A candidate for listing or has been placed in the threatened or endangered species list pursuant to the federal “Endangered Species Act of 1973”, 16 U.S.C. sec. 1531 et seq., as amended.