S.C. Code § 44-23-220
No person who is mentally ill or who has an intellectual disability shall be confined for safekeeping in any jail. If it appears to the officer in charge of the jail that such a person is in prison, he shall immediately cause the person to be examined by two examiners designated by the Department of Mental Health or the Department of Disabilities and Special Needs, or both, and if in their opinion admission to a mental health or intellectual disability facility is warranted, the officer in charge of the jail shall commence proceedings pursuant to Sections 44-17-510 through 44-17-610, or Section 44-21-90. If hospitalization is ordered, the person shall be discharged from the custody of the officer in charge of the jail and shall be admitted to an appropriate mental health or intellectual disability facility.
S.C. Code § 44-23-220