13-1-111. Qualifications of voter. (1) A person may not vote at elections unless the person is:

(a) registered as required by law;

(b) 18 years of age or older;

(c) a resident of the state of Montana and of the county in which the person offers to vote for at least 30 days, except as provided in 13-2-514; and

(d) a citizen of the United States.

(2) A person convicted of a felony does not have the right to vote while the person is serving a sentence in a penal institution.

(3) A person adjudicated to be of unsound mind does not have the right to vote unless the person has been restored to capacity as provided by law.