S.D. Codified Laws § 21-18-26
Within thirty days from the service of such garnishee summons the garnishee may, if the truth warrants, file with the clerk of the court in which the action is pending, and serve a copy thereof upon the plaintiff, his affidavit in substantially the following form:
State of South Dakota,
County of __________ ss. ________ Court
A. B., Plaintiff, vs.
C. D., Defendant,
E. F., Garnishee.
E. F., being duly sworn, says that on the ____ day of ________, 20____, he was served with a garnishee summons in the above entitled action; that he was then in no manner and upon no account whatever indebted or under liability to the defendant (naming him), and that he then had in his possession or under his control, no real estate and no personal property, effects, or credits of any description whatever, belonging to said defendant or in which he had any interest; and is in no manner liable as garnishee in this action.
___________________________
Subscribed and sworn to before me this ____ day of ________, 20____.
SDCL 21-18-26