Section 264(b) in Police Regulations, Bengal , 1943
(b)A case diary shall be submitted in every case investigated. The diary relating to two or more days shall never be written on one sheet or despatched together. Two or more cases should never be reported in one diary; a separate diary shall be submitted in each case daily until the enquiry is completed. But it is not necessary to send one on any day on which the investigation, though pending, is not proceeded with.