S.C. Code § 4-9-180
Any county officer or employee who has a substantial financial interest in any business which contracts with the county for sale or lease of land, materials, supplies, equipment or services or who personally engages in such matters shall make known that interest and refrain from voting upon or otherwise participating in his capacity as a county officer or employee in matters related thereto.
Any county officer or employee who wilfully violates the requirements of this section shall be deemed guilty of malfeasance in office and upon conviction shall forfeit his office or position. Violation of this section with the knowledge express or implied of the person or corporation contracting with or making a sale to the county shall render the contract or sale voidable by the county governing body.
S.C. Code § 4-9-180