Ooh almond snickers!
DS is 15. The 136 suite where he was taken is part of an adult psychiatric hospital, iirc under s136 you can be taken to a "place of safety" which can be a police station, or other secure places. So we were lucky (bitter laugh) that he ended up there but in fairness I have to say that IMHO DS has received absolutely amazing care ever since he was picked up by the police in December.