S.C. Code Regs. § § 61-4.400.410
An employee who has knowledge or suspicion of drug diversion from his or her employer by a fellow employee shall report such information to a responsible security official of the employer, or to a person in a management position with the employer. The employer shall treat such information as confidential and shall take all reasonable steps to protect the confidentiality of the information and the identity of the employee furnishing information. A failure to report information of drug diversion will be considered in determining the feasibility of continuing to allow an employee to work in a drug security area, or with access to controlled substances. The employer shall inform all employees concerning this policy.
S.C. Code Regs. § 61-4.400.410