S.C. Code § 63-9-510
Once a petitioner has received the adoptee into his home and a petition for adoption has been filed, the petitioner has temporary custody of the adoptee and is responsible for the care, maintenance, and support of the adoptee, including necessary medical or surgical treatment, except as provided in Article 7. A postplacement investigation and report of this investigation pursuant to Section 63-9-520 must be completed before the final hearing. Unless the adoptee is removed pursuant to Subarticle 3, Article 3, Chapter 7, when adoptive parents have received the adoptee into their home for the purpose of adoption but no petition has been filed pursuant to Section 63-9-710, the child-placing agency shall secure an order from the family court before removal of the child from the adoptive parents. At the hearing the burden of proof is on the child-placing agency to prove that continued placement with the adoptive family is not in the adoptee's best interest.
S.C. Code § 63-9-510