Pseudo-model Monique Chau Hoi-ying, who was put on probation for a year in January for possessing ketamine in a school toilet, was found yesterday to be in breach of the order. In Eastern Court, Acting Principal Magistrate Amanda Woodcock extended the order for a year and sent her to a residential rehabilitation centre. Chau, 17, had been told to stay off drugs, but a recent test returned a positive result.