A mentally ill man was jailed for three months today after admitting sexually assaulting a 17-year-old girl on a bus.Kevin Rubaine, 36, of no fixed abode, pleaded guilty to persistently touching the young girl’s right thigh as they rode the bus on July 5.Suffering from Klüver–Bucy syndrome — a rare illness affecting one in every million men — Rubaine received three months imprisonment due to his likelihood of reoffending, said Senior Magistrate Archibald Warner.“Treating mental health illnesses is not about locking people up and throwing away the key,” said Mr Warner. “We are working feverishly toward a mental health court, but there is still a long way to go.”He said he hoped Government recognised the need for a serious forensic facility in which mentally ill defendants could be treated long-term.“If we want to protect both society and the individual with mental health issues, we must have a forensic facility,” he said.Mr Warner also sentenced Rubaine to two years probation, subject to the conditions set out in a social inquiry report.