Section 2 (h) of the CRPC reads as under:
2.(h) “investigation” includes all the proceedings under this Code for the collection of evidence conducted by a police officer or by any person (other than a Magistrate) who is authorised by a Magistrate in this behalf;
Section 2(h) CrPC defines “investigation” and it includes all the proceedings under the Code for the collection of evidence conducted by a police officer or by any person (other than a Magistrate) who is authorised by a Magistrate in this behalf. It ends with the formation of the opinion as to whether on the material collected, there is a case to place the accused before a Magistrate for trial and if so, taking the necessary steps for the same by filing of a charge-sheet under Section 173. Union of India v. Prakash P. Hinduja .
A three Judge Bench in H.N. Rishbud v. State of Delhi , while dealing with investigation, has stated that under the Code, investigation consists generally of the following steps:
(a) Proceeding to the spot,
(b) Ascertainment of the facts and circumstances of the case,
(c) Discovery and arrest of the suspected offender,
(d) Collection of evidence relating to the commission of the offence which may consist of:
(i) The examination of various persons (including the accused) and the reduction of their statements into writing, if the officer thinks fit,
(ii) The search of places or seizure of things considered necessary for the investigation and to be produced at the trial, and
(e) Formation of the opinion as to whether on the material collected there is a case to place the accused before a Magistrate for trial and if so taking the necessary steps for the same by the filing of a chargesheet under Section 173.
In Adri Dharan Das v. State of W.B. , it has been opined that:
“arrest is a part of the process of investigation intended to secure several purposes. The accused may have to be questioned in detail regarding various facets of motive, preparation, commission and aftermath of the crime and connection of other persons, if any, in the crime.”
In Niranjan Singh v. State of U.P. , it has been laid down that investigation is not an inquiry or trial before the Court and that is why the Legislature did not contemplate any irregularity in investigation as of sufficient importance to vitiate or otherwise form any infirmity in the inquiry or trial. In S.N.Sharma v. Bipen Kumar Tiwari , it has been observed that the power of police to investigate is independent of any control by the Magistrate. In State of Bihar v. J.A.C. Saldanha , it has been observed that there is a clear cut and well demarcated sphere of activity in the field of crime detection and crime punishment and further investigation of an offence is the field exclusively reserved for the executive in the Police Department. Manubhai Ratilal Patel v. State of Gujarat and Others,(2013) 1 SCC 314.
The mere undertaking of a further investigation either by the investigating officer on his own or upon the directions of the superior police officer or pursuant to a direction by the Magistrate concerned to whom the report is forwarded does not mean that the report submitted under Section 173 (2) is abandoned or rejected. It is only that either the investigating agency or the court concerned is not completely satisfied with the material collected by the investigating agency and is of the opinion that possibly some more material is required to be collected in order to sustain the allegations of the commission of the offence indicated in the report. Vipul Shital Prasad Agarwal v. State of Gujarat and another, (2013) 1 SCC 197.