Upon approval by the court, a child who is subject to involuntary treatment under this chapter may at any time convert to a voluntary status if informed consent to treatment can be obtained from his parent or guardian. The court shall approve conversion from involuntary to voluntary status if the court finds that:
(1) The child is not likely to cause harm to himself or suffer substantial mental or physical deterioration; and (1)(a) The child is not likely to cause harm to himself or suffer substantial mental or physical deterioration; and
(2) The child is not likely to cause harm to others; or
(3) The conversion from involuntary to voluntary status is in the best interests of the child and consistent with the requirements of public safety.