Section 626(a) in Police Regulations, Bengal , 1943
(a)Inspectors and superior officers of the Criminal Investigation Department are superior in rank to an officer-in-charge of a police-station and, as such may, under section 551, Code of Criminal Procedure, exercise throughout the local area to which they are appointed, the same powers as may be exercised by an officer-in-charge of a police-station within the limit of his station. They accordingly have power to detail a Sub-Inspector of the Criminal Investigation Department to investigate a particular case when it is considered desirable that the case should be so investigated.
