Section 189(e) in Police Regulations, Bengal , 1943
(e)He shall not ordinarily conduct investigations, but shall supervise, taking up cases only for very special reasons, such as mismanagement by the ordinary investigating officer or the unusual importance or intricacy of the facts. He shall take special note of the progress of important cases and be ready to assist in any investigation where his assistance is required. He shall see that each case is fully and properly investigated and that all possible steps are taken to ensure detection. In respect of the control he shall exercise over investigations, he shall act in direct subordination to the Sub-divisional Police-Officer and the Superintendent.
