S.D. Codified Laws § 25-5A-32
The emergency medical services provider or a licensed child placement agency shall immediately notify the Department of Social Services that the provider or agency has taken possession of the child. The department or licensed child placement agency shall assume the care, custody, and control of the child immediately upon receipt of the notice. However, a licensed child placement agency that has taken possession of a child may assume the care, custody, and control of the child. The department or licensed child placement agency may not attempt to identify, contact, or investigate the parent who voluntarily delivered the child to an emergency medical services provider or a licensed child placement agency unless it appears the child has been harmed.
SDCL 25-5A-32