S.C. Code Ann. Regs. 27-1035
(C) Which Cattle Are to Be Tested—All female cattle and bulls over 6 months of age shall be blood tested for brucellosis with the following exceptions:
(D) Wherein Cattle Are Brucellosis Tested—Cattle shall be presented at the Livestock Auction Market prior to the sale and the seller or his agent shall indicate whether such cattle are to be sold for dairy or breeding purposes or for the highest dollar.
If the owner elects to sell his cattle for any of the foregoing, they shall be blood tested for brucellosis. The Livestock Auction Market Veterinarian shall take a blood sample from the cattle and shall run a preliminary brucellosis blood test on the serum. If the cattle be negative to this preliminary test, they or she may be sold as brucellosis negative subject to a re-test of the blood by the Official State Brucellosis Laboratory.
If cattle react to the preliminary blood test in serial dilutions that would classify the animal a suspect to brucellosis, then said cattle must be sold for immediate slaughter or returned to the seller's premises under quarantine. If cattle react to the preliminary blood test in serial dilutions that would classify the cattle as reactors, then such animal or animals must be branded and tagged by the Livestock Auction Market Veterinarian as brucellosis reactors and sold for immediate slaughter or returned to the seller's premises under quarantine.