An employee, volunteer, or official of the Department of Social Services required or authorized to perform child protective or child welfare-related functions or an individual with whom the department has contracted to convene family group conferences or a law enforcement officer required or authorized to perform child protective or child welfare related functions is immune from civil or criminal liability which might otherwise result by reason of acts or omissions within the scope of the official duties of the employee, volunteer, convener, officer, or official, as long as the employee, volunteer, convener, officer, or official acted in good faith and was not reckless, wilful, wanton, or grossly negligent. In all such civil or criminal proceedings good faith is rebuttably presumed. This grant of immunity is cumulative to and does not replace any other immunity provided under the South Carolina Tort Claims Act.