Wyo. Const. art. 6, § 12: Registration of voters required.

No person qualified to be an elector of the State of Wyoming, shall be allowed to vote at any general or special election hereafter to be holden in the state, until he or she shall have registered as a voter according to law, unless the failure to register is caused by sickness or absence, for which provisions shall be made by law. The legislature of the state shall enact such laws as will carry into effect the provisions of this section, which enactment shall be subject to amendment, but shall never be repealed; but this section shall not apply to the first election held under this constitution.