Procedure of Magistrate :
(1) The Magistrate under Sec. 156(3) is empowered to order Police Officer to investigate any offence under Sec. 190 CrPC on receipt of a private complaint and on examination of complainant and other evidence;
(2) Then the process of investigation by Police follows as mentioned here under:
Duty of Police on receipt of information of crime in matter of cognizable offences:—
(a) Any person can give a complaint to the concerned Police or any Police who in turn makes it over to the concerned Police for investigation either in writing or to his/her direction which is reduced into writing by the Police Officer about the crime;
(b) If the report is oral, the writing of Police Officer shall be signed by the informant (Sec. 154(1) Cr.P.C.);
(c) Substance of information is entered in Station Diary or General Diary maintained by the Police and then furnish Crime No.……… for such FIR;
(d) The Police then despatch copy of FIR to the concerned Magistrate at the earliest (Sec. 157(1) Cr.P.C.);
(e) The Police then proceed to investigate into the crime; which involves inspection of the spot of incident, search and seizure of articles (Material Objects, popularly, in criminal trials known as MO’s); arrest of the accused with or without warrant; production of accused within 24 hours of arrest before Magistrate (Sec. 54 Cr.P.C.) examination of witnesses (Popularly known as 161/162 statements) etc.
(f) On completion of investigation, either refer the matter or proceed to inventigate and file charge-sheet before the Magistrate with all investigation reports etc., all documents, material objects along with statements of witnesses recorded under Sec.161 IPC;
(g) The time limit for completion of investigation by the Police under proviso to Sec.167(2) is 90 days or 60 days considering the gravity of offence;
(h) The Police thereafter is under duty to co-operate in the trial-procedure before the Court of law by examination of de facto complainant, witnesses, marking of things or documents or articles, examination of the Police Officer and investigating officer etc.