A court may not make a restriction order or any other order under this Act that commits a person who has not attained the age of 18 years to a secure mental health unit unless the court has received a report from the Chief Psychiatrist to the effect that (a) adequate facilities and staff exist at the secure mental health unit for the appropriate care and treatment of the person; and(b) the secure mental health unit is the most appropriate place available to accommodate the youth in the circumstances.