SDCL § 2-1-6: Persons qualified to sign petitions--False or unqualified signing as misdemeanor.

Every person who is a qualified voter may sign a petition to initiate a constitutional amendment or other measure or to refer a law. If a person, knowing he or she is not a qualified voter of the state or knowing that he or she has already signed the same petition, signs a petition for initiation of a constitutional amendment or other measure or for referral of legislation or if any person signs a name other than his or her own, that person is guilty of a Class 1 misdemeanor.