S.C. Code Ann. § 40-57-139
(A) A licensee shall provide in a timely manner to all buyers and sellers with whom the licensee works:
(E) A licensee who begins working with a potential buyer shall provide to the potential buyer a completed agency disclosure form at the first substantive contact. At the time of contact, it must be established between licensee and potential buyer whether the buyer will be a "customer" or "client". Substantive contact must be the earlier of: