(1) A child placing agency or the department that acquires legal and physical custody of a child pursuant to section 29 of this chapter or chapter XIIA may formally place a child for adoption under section 51 of this chapter. A child placing agency that acquires written authorization pursuant to subsection (3) from the parent or guardian having legal custody of a child may make a temporary placement of the child under section 23d of this chapter. A child placing agency may assist a parent or guardian to make a direct placement under section 23a of this chapter.

    (2) In an agency placement, a child placing agency or the department may involve the parent or guardian of a child in the selection of an adoptive parent and may facilitate the exchange of identifying information or meetings between a biological parent and an adoptive parent.

    (3) In a written document signed by a witness and by the parent or guardian in the presence of the witness, a parent or guardian having legal and physical custody of a child may authorize a child placing agency to make a temporary placement of the child under section 23d of this chapter. If the parent of the child being temporarily placed is an unemancipated minor, the authorization is not valid unless it is also signed in the presence of the witness by a parent or guardian of that minor parent.