S.C. Code § 5-7-130
Any municipal officer or employee who has a substantial financial interest in any business which contracts with the municipality 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 city officer or employee in matters related thereto.
Any city officer or employee who wilfully conceals such a substantial financial interest or wilfully violates the requirements of this section shall constitute 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 city shall render the contract or sale voidable by the municipal governing body.
S.C. Code § 5-7-130