SDCL § 37-21-10: Investigation upon complaint.

If a complaint is made to the secretary that any false or incorrect scales, weights, or measures are being made use of by any person in the purchase or sale of merchandise or other commodities or in weighing any article or commodity, the piece price for which is determined by weight or measure, the secretary shall investigate the complaint as soon as possible. The secretary shall make such other inspections of the weights and measures as in the secretary's judgment are necessary or proper to be made, except where inspection is provided for by chapter 37-22 or 37-22A.