Section 189(c) in Police Regulations, Bengal , 1943
(c)He shall, from a study of the crime maps of the police-stations within his circle, and from an intelligent use of his index of crime, or note book of crime against property, ascertain the criminal areas in his circle and pay particular attention to them. He shall carefully study the diaries of all cases occurring in those areas, and satisfy himself that the Sub-Inspectors are concentrating their attention on them. Where necessary, he shall arrange for the proper patrolling of such areas both by the regular and the rural police, and shall satisfy himself, by frequent surprise visits, that his Sub-Inspectors and their subordinates are patrolling effectively. He shall also make prolonged visits to such areas, ascertain, whenever possible, the criminals who are responsible, and then frame a definite line of policy to be adopted, both for the prevention of crime in future by seeing that surveillance is effective and not nominal, and by instituting such other measures as the circumstances of the case indicate.
