S.C. Code Ann. § 44-53-160
(1) Annually, within thirty days after the convening of each regular session of the General Assembly, the Department shall recommend to the General Assembly any additions, deletions or revisions in the schedules of substances, enumerated in Sections 44-53-190, 44-53-210, 44-53-230, 44-53-250 and 44-53-270, which it deems necessary. The Department shall not make any additions, deletions or revisions in such schedules until after notice and an opportunity for a hearing is afforded all interested parties. In making a recommendation to the General Assembly regarding a substance, the Department shall consider the following: