South Dakota Codified Laws
Chapter 01 - Notaries Public
Section 18-1-12.2 - Party to transaction as notary public prohibited.

18-1-12.2. Party to transaction as notary public prohibited.
It is a Class 1 misdemeanor for a person to affix a signature to a document as a notary public when the person has also signed the document as a party to the transaction proceeding.

Source: SL 1997, ch 120, ยง6.