S.C. Code Ann. § 43-5-340

Whenever the county department receives an application for assistance under this article, an investigation and record shall promptly be made of the circumstances of the applicant in order to ascertain the facts supporting the application and in order to obtain such other information as may be required by the rules of the State Department. The investigation may include a visit to the home of the applicant if deemed necessary by the caseworker or supervisor.