The principle object of the FIR from the point of view of the informant is to set the criminal law in motion and from the point of view of the investigation authorities is to obtain information about the alleged criminal activity so as to be able to take suitable steps for tracing and bringing to book the guilty party. The FIR does not constitute the substantive evidence though its importance as conveying the earliest information regarding the occurence cannot be doubted. FIR can, however, be used as a previous statement for the purpose of either corroborating its maker under Section 157 of the Indian Evidence Act, or for contradicting him under Section 145 of that Act as held by the Supreme Court in the case of Shaikh Hasib alias Tabarak vs The State of Bihar, (1972) 4 SCC
Introduction to the power of Investigation on Information
The learned Chief Justice, Y.V Chandrachud and Justice A.N. Sen, speaking for the Bench in their concurring opinion held as under: “Whether an offence has been disclosed or not must necessarily depend on the facts and circumstances of each particular case. If on a consideration of the relevant materials, the Court is satisfied that an offence is disclosed, the Court will normally not interfere with the investigation into the offence and will generally allow the investigation in the offence to be completed for collecting materials for proving the offence.
The condition precedent to the commencement of investigation under S.157 of the Code is that the F.I.R. must disclose, prima facie, that a cognizable offence has been committed. It is wrong to suppose that the police have an unfettered discretion to commence investigation under S.157 of the Code. Their right of inquiry is conditioned by the existence of reason to suspect the commission of a cognizable offence and they cannot, reasonably, have reason so to suspect unless the F.I.R., prima facie, discloses the commission of such offence. If that condition is satisfied, the investigation must go on. The Court has then no power to stop the investigation, for to do so would be to trench upon the lawful power of the police to investigate into cognizable offences
Section 154 of Cr.P.C
It is Chapter XII of the Code, which deals with „information‟ to the police and the power of the police to conduct „investigation‟. Ordinarily,  it is the First Information Report, which sets the machinery of law in motion.  Let us, therefore, consider, first, the provisions contained in Section 154 of the Code.
Informing Cognizable Offence to Police
Informing Cognizable Offence to Magistrate
Informing Non-Cognizable Offence
Information to the Protection Officer for Domestic Violence
Writ petition  for registration of FIR
Second FIR
Preliminary inquiry before registering information
Delay in reporting Information
Information supplied byÂ
Information  by Hospital authority and passed on to police
Injured Victim before Death
Mother of the Victim
Public Servant
Officer -in -Charge of the police station
Corporation
Additional information and supplementary statement
FIR by CBI
Specific Information
 Rape Case
 Murder Case
Theft
Robbery & Dacoity
 under NDPS Act
under Anti Corruption Act
Under Maharastra Control of organised crime Act and like
Dying Declaration Recorded at 8.00PM and FIR lodged at 9.00PM
