S.C. Code § 44-23-440
A finding of unfitness to stand trial under Section 44-23-430 does not preclude any legal objection to the prosecution of the individual which is susceptible of fair determination prior to trial and without the personal participation of the defendant.
If either the person found unfit to stand trial or his counsel believes he can establish a defense of not guilty to the charges other than the defense of insanity, he may request an opportunity to offer a defense on the merits to the court. The court may require affidavits and evidence in support of such request. If the court grants such request, the evidence of the State and the defendant shall be heard before the court sitting without a jury. If after hearing such petition the court finds the evidence is such as would entitle the defendant to a directed verdict of acquittal, it shall dismiss the indictment or other charges.
S.C. Code § 44-23-440