The number of police psychologists is to be doubled to six, with one investigating the screening of recruits, in the wake of last year's alleged killing of a prisoner by a constable. The recommendations are among 19 made in a report on the management of officers with mental health problems accepted by Commissioner Eddie Hui Ki-on. Mr Hui ordered the review after Constable Yau Chun-sing, 27, who has a record of mental problems, allegedly shot and killed 24-year-old Chan Kwok-keung at Aberdeen Police Station on November 1. Assistant Commissioner Ng Wai-kit said the doubling of manpower and the recruiting of three clerical staff would cost $3 million a year. Two new psychologists will be hired by September. Five of the psychologists will provide counselling services to officers while the sixth, to be recruited by the next financial year, will work at the training school. Mr Ng said the training school psychologist would be asked to research screening tests on recruits or job applicants. 'Candidates who have to take physical and written tests at present may have to take one more psychological screening test in future. But more research will need to be done on this idea.' Mr Ng said stress management and awareness of mental problems would be added to training courses for all officers. Senior staff would be taught how to identify and manage mental health problems. The review also recommended the introduction of a system to give priority attention to officers with four types of mental health problem - severe mental disorders, suicidal behaviour, acute personal crisis and substance dependency. Any officers identified with the problems will be interviewed by a psychologist within 48 hours and a case conference will be held regularly to assess their conditions, including their suitability to carry firearms.