SDCL § 18-1-7: Notarial acts of interested person or agent valid if not principal party to instrument.

A person who is personally interested directly or indirectly, or as a stockholder, officer, agent, attorney, or employee of any other person or party to a transaction concerning which the person is performing the function of a notary public, may make any certificate, take any acknowledgment, administer any oath, or do any other official act as a notary public with the same legal force and effect as if the person had no interest, provided the instrument or document does not show upon its face that the person is a principal party to the instrument or document.