Police officer’s powers to investigate cognizable case :
In case of a cognizable offence the police officer may conduct investigations without the order of a Magistrate. Investigation includes all proceedings under the Code for the collection of evidence by the police officer or by any person who is authorised by the Magistrate in this behalf. Any Magistrate empowered under Section 190 may order such investigation as above mentioned. Sections 160 and 161 authorise a police officer making an investigation to require the attendance of and may examine orally any person who appears to be acquainted with the facts and circumstances of the case. (Section 156)