S.C. Code Ann. § 58-17-1990

All such discriminating rates, charges, collections or receipts as are described in Section 58-17-1980, whether made directly or by means of any rebate, drawback or other shift or evasion, shall be deemed and taken against such railroad as prima facie evidence of the unjust discrimination prohibited by the provisions of this article. This section shall not be construed so as to exclude other evidence tending to show any unjust discrimination in freight and passenger rates.