S.D. Codified Laws § 18-1-11.8

The failure of a notarial officer to perform a duty or meet a requirement specified by law does not invalidate a notarial act performed by the notarial officer. The validity of a notarial act does not prevent an aggrieved person from seeking to invalidate the record or transaction that is the subject of the notarial act or from seeking other remedies based on the law of this state or the law of the United States. Nothing in this section validates a purported notarial act performed by an individual who does not have the authority to perform notarial acts.