S.C. Code Ann. § 3-1-20: Retention of concurrent jurisdiction for service of civil and criminal process.

Such jurisdiction is granted upon the express condition that the State shall retain a concurrent jurisdiction with the United States in and over such lands, so far as that civil process in all cases not affecting the real or personal property of the United States and such criminal or other process as shall issue under the authority of the State against any person charged with crimes or misdemeanors committed within or without the limit of such lands may be executed therein in the same way and manner as if no jurisdiction had been hereby ceded.