S.C. Code Ann. § 56-5-2941
In addition to the penalties required and authorized to be imposed against a person violating the provisions of Section 56-5-2930 , 56-5-2933, or 56-5-2945, the court may require such person, whether or not he is a first or subsequent offender and if he is a resident of this State, to have installed on the vehicle he was operating if it is registered and licensed in his name or in the name of a member of his immediate family an ignition interlock device designed to prevent the operation of the motor vehicle if the operator has consumed alcoholic beverages. The court in imposing the requirements of this section shall specify the length of time which the interlock device is required to be affixed to the vehicle, shall provide that the cost of the interlock device must be borne by the offender, and shall require the offender to periodically report to appropriate law enforcement or probation authorities for the purpose of verifying that the interlock device is affixed to the vehicle and operational during the time required by the court. The State Law Enforcement Division, in consultation with the Department of Public Safety, shall develop regulations including, but not limited to, regulations governing the use, maintenance, and operation of ignition interlock devices.
If the offender is determined to be indigent by the court and cannot afford the cost of the ignition interlock device, the court may order an interlock device to be affixed to the vehicle and paid for by the jurisdiction making the arrest from fines paid pursuant to Sections 56-5-2930, 56-5-2933, and 56-5-2945.