S.D. Codified Laws § 40-20-4
Except as otherwise provided in this chapter, it is a Class 2 misdemeanor to remove or authorize the removal of livestock from any point within the livestock ownership inspection area, to any point within one mile of the border with a destination outside the ownership inspection area, unless the livestock have been inspected for ownership and the shipper possesses the local ownership inspection certificate, market clearance, shipper's permit, or other form of authorization required by the board.
Except as otherwise provided in § 40-20-29, a local ownership inspection certificate is valid for the transportation of livestock, other than horses, out of the livestock ownership inspection area for twenty-four hours after the time of the inspection, as noted on the inspection certificate. In the case of horses, the certificate is valid for thirty days after the date of the inspection, as noted on the certificate.
If there is no valid local ownership inspection certificate, the livestock must be inspected before leaving the ownership inspection area.
Livestock being removed from the ownership inspection area, without authorization from the board, may be impounded by any law enforcement officer, until the livestock are inspected for ownership by an inspector.
The venue for the prosecution of any offense under this section is the county where the livestock were loaded, or any county through which the livestock were transported or trailed.
Any livestock being transported to a destination outside the ownership inspection area must be inspected for ownership if they cease to be in the custody of the carrier at any time prior to leaving the ownership inspection area.
Any livestock shipper within the livestock ownership inspection area wanting livestock inspected, as provided in this section, shall notify an inspector in advance of the inspection and allow the inspector reasonable time to provide the inspection.
SDCL 40-20-4