Despite any other Act or law, the chief executive is authorised to give consent to any medical treatment of a child in the chief executive’s custody if—
(a) the medical treatment requires the consent of a guardian of the child; and
(b) the chief executive is unable to ascertain the whereabouts of a guardian of the child despite reasonable inquiries; and
(c) it would be detrimental to the child’s health to delay the medical treatment until the guardian’s consent can be obtained.