42 U.S.C. § 671(a)(8)

As a condition of receiving federal funding for child welfare services under Title IV-B of the Social Security Act, a state must establish safeguards that restrict the use of or disclosure of information concerning individuals who receive child welfare services. Information regarding clients may be used or disclosed only:
for purposes directly connected with the administration of state Temporary Assistance for Needy Families, child welfare, adoption, and foster care assistance, child support enforcement, Medicaid, or Social Services Block Grant programs, or the federal Supplemental Security Income program, or other federal or federally-assisted needs-based programs; or
to report or provide information to appropriate authorities with respect to known or suspected abuse or neglect of a child who receives services or assistance under Title IV-B or Title IV-E of the Social Security Act.

Children's Services
Economic Services

Federal statute