S.C. Code Ann. § 20-7-1705
(A) The sworn document provided for in Section 20-7-1700, which gives consent or relinquishment for the purpose of adoption, must be signed in the presence of two witnesses one of whom must be one of the following:
(4) when the consent or relinquishment is obtained outside of this State, by an attorney licensed to practice law in that state, by a person designated by an agency of that state, by a person or agency authorized by that state's law to obtain consents or relinquishments or to conduct investigations for adoptions, or by a qualified resident of that state authorized by a South Carolina family court. When a consent or relinquishment is obtained outside of this State, it may be accepted as valid in this State, provided the court determines: