S.C. Code Ann. § 24-3-951

Effective July 1, 1995, notwithstanding Section 24-3-956 and any other provision of law, United States currency or money, as it relates to use within the state prison system, is declared contraband and must not be utilized as a medium of exchange for barter or financial transaction between prisoners or prison officials and prisoners within the state prison system, except prisoners on work release or in other community based programs. Inmates must not possess United States currency. All financial disbursements to prisoners or mediums of exchange between prisoners and between the prison system and prisoners shall be transacted with a system of credits.