Section 99

Where in any case, from the gravity of the offence for which any child or young person may be in custody or for any other reason, the person‑in‑charge of the place where the child or young person is detained considers it to be desirable to take special measures for the security of the child or young person while under treatment in an approved hospital, it is lawful for the person‑in‑charge to give the child or young person into the charge of at least one fit and proper person who must always be with the child or young person day and night.

The person referred to in subsection (1) is vested with full power and authority to do all things necessary to prevent the child or young person from escaping, and is answerable for his or her safe custody until such time as he or she is handed over to the person‑in‑charge on his or her discharge from the approved hospital or until such time as his or her period of detention expires, whichever is earlier.[73