S.C. Code Ann. § 40-33-20
It is unlawful for any person to practice as a registered nurse or a practical nurse, to use the abbreviation "R.N." or "L.P.N." or any sign, card, or device to indicate that a person is a registered nurse or a licensed practical nurse, within the meaning of this chapter, in this State, who fails to comply with the provisions of this chapter, to include a lapsed license, an inactive license, a voluntarily surrendered license, and anyone violating any of the provisions of this chapter is guilty of a misdemeanor and, upon conviction must be fined not less than five hundred dollars or imprisoned for a period of not less than thirty days, or both.