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Crime investigation: FIR to charge-sheet

Criminology and Police Administration (BA / B.Sc) · Police and investigation · free study notes for exams, placements and interviews

In short

Crime investigation is the statutory sequence by which the police convert information about an offence into evidence fit for trial: recording the first information, visiting the scene, collecting physical and oral evidence, arresting and interrogating the accused, and filing a final report (charge-sheet) before a competent magistrate. Since 1 July 2024 the process is governed by the Bharatiya Nagarik Suraksha Sanhita, 2023 (BNSS), which replaced the Criminal Procedure Code, 1973, with the Bharatiya Nyaya Sanhita, 2023 (BNS) supplying the offences and the Bharatiya Sakshya Adhiniyam, 2023 (BSA) the law of evidence. The topic is the backbone of Criminology and Police Administration papers on "Police and Investigation", and is asked in every interview for police sub-inspector and constable recruitment (SSC CPO, state PSC, CAPF), and in private roles — corporate investigations, insurance fraud, compliance and legal-process outsourcing — where staff must read an FIR and a charge-sheet correctly. Note that BNSS is recent law: section numbers below are the BNSS numbers, with the old CrPC equivalent in brackets only where the mapping is settled.

Explained

Information, cognizable and non-cognizable offences

The investigation: scene, documents and evidence

  1. Entry in the station diary and dispatch of the FIR copy — a copy of the FIR must be sent forthwith to the jurisdictional magistrate so an external, time-stamped record exists; delay in FIR dispatch is a standard defence point.
  2. Visit to the scene (s.175, former s.157) — the officer in charge proceeds in person or deputes a subordinate; the scene is cordoned, photographed and the site plan (rough and scaled) prepared.
  3. Forensic collection is now compulsory: BNSS s.176(3) requires, for offences punishable with 7 years or more, that a forensic expert visit the scene and collect and videograph the evidence; where the state lacks facilities it may use another state's, and states were given up to five years from commencement to build the capacity.
  4. Case diary (s.192, CrPC s.172) — a day-by-day record of the investigation, now to be maintained with paragraph-numbered entries. The court may use it to aid the trial, but it is not evidence; the accused cannot claim it as of right, though they may use it if the police refer to it (s.192(3) read with BSA provisions on refreshing memory).
  5. Inquest (s.194, CrPC s.174) in unnatural, suicidal, accidental or suspicious deaths — the officer records the apparent cause, injuries and weapons in the inquest report (panchnama) before witnesses, and forwards the body for post-mortem; a magisterial inquiry under s.196 (CrPC s.176) is mandatory for custodial deaths, death in police firing, and deaths of women in custody or within seven years of marriage in specified circumstances.
  6. Search and seizure — with warrant (ss.96-103) or without, in the situations the BNSS allows (s.185, former s.165, search by the investigating officer after recording grounds). Searches require two independent and respectable local witnesses, a seizure memo / search list signed by them, and a copy to the occupant. BNSS s.105 requires audio-video recording (preferably by mobile phone) of search and seizure, including the list of seized articles, and the recording to be forwarded to the magistrate without delay.
  7. Chain of custody — sealed packets with the IO's distinctive seal, specimen seal to the court, Form for forwarding exhibits to the FSL, acknowledged receipts at each transfer; a break in the chain is the commonest reason forensic reports are discounted.
  8. Statements of witnesses (s.180, CrPC s.161) — recorded by the IO; not signed by the maker, and not substantive evidence: under s.181 (CrPC s.162) they may be used only to contradict the witness in cross-examination, after the portion is put to them. Statements may be recorded by audio-video electronic means.
  9. Statement before a magistrate (s.183, CrPC s.164) — confessions and statements recorded by a Judicial Magistrate after the prescribed warning and voluntariness check; a confession so recorded is admissible, unlike one to the police.
  10. Identification — Test Identification Parade (TIP) conducted by a magistrate or executive magistrate with similar-looking dummies; it is only corroborative of identification in court. BNSS s.349 (CrPC s.311A) empowers a magistrate to order an accused or any person to give specimen signature, handwriting, finger impressions and voice samples, including from a person not arrested.
  11. Expert and medical evidence — injury report, post-mortem, FSL report on viscera, DNA, ballistics, fingerprints, cyber forensics; the Government Examiner of Questioned Documents for documents. Under the BSA, an electronic record must be accompanied by the prescribed certificate for admissibility.
  12. Completion within time: investigation must be completed without unnecessary delay; for specified sexual offences against children and women the BNSS requires completion within two months from the date of recording the information.

Arrest, custody and bail during investigation

Report on completion: charge-sheet and closure

Timelines, forms and the electronic layer

Advantages, limitations and the evidentiary value of each document

DocumentStatuteSigned by makerSubstantive evidence?Main use
FIRBNSS s.173Yes, by informantNoCorroborate/contradict the informant; fix the time of first report
Witness statement to policeBNSS s.180NoNoContradiction in cross-examination only (s.181)
Statement/confession before magistrateBNSS s.183YesYes (confession, if voluntary)Proof against maker; corroboration
Case diaryBNSS s.192IONoAid to the court; not for the defence as of right
Inquest reportBNSS s.194IO + witnessesNoCorroboration on the state of the body
Charge-sheetBNSS s.193IO/SHONoBasis for cognizance and framing of charge
Confession to a police officerBSA (former Evidence Act s.25)—InadmissibleOnly the discovery part (former s.27) is saved

Key points

Formulas and examples

Default-bail deadline = date of first remand + 60 or 90 days (not the date of arrest or of the FIR); 90 days applies where the offence is punishable with death, life imprisonment, or imprisonment for 10 years or more; 60 days otherwise.
Detention limit before production = 24 hours from arrest, excluding the time of journey from the place of arrest to the magistrate's court (BNSS s.58; Constitution, Art. 22(2)).
Preliminary enquiry window = 14 days from receipt of information, available only where the punishment is 3 years or more but less than 7 years, with prior permission of an officer not below DSP rank.
Further investigation after charge-sheet = 90 days without the court's permission; beyond that, only with leave (BNSS s.193(9) scheme).
FIRComplaintCharge-sheet (police report)Charge
ProvisionBNSS s.173BNSS s.2(1) definition of complaint; s.223BNSS s.193; "police report" defined in s.2BNSS ss.234-246
Made byInformant, to the policeComplainant, to a magistrateOfficer in charge of the stationFramed by the court
OffenceCognizable only (s.173); non-cognizable goes to s.174Any offenceAny offence investigatedAny offence tried
StageStart of investigationStart of a complaint caseEnd of investigationStart of trial
EffectInvestigation beginsMagistrate inquires under s.225 and may issue processMagistrate may take cognizance under s.210Accused is told exactly what he must answer
Police custodyJudicial custody
Who holds the accusedPolice lock-upJail, under the court
PurposeInterrogation and recoverySafe custody pending investigation/trial
Outer limitFirst 15 days of the total period (BNSS allows it in parts within the initial 40/60 days)Up to 60/90 days before charge-sheet, then as the trial requires
Confession valueConfession to police inadmissible (BSA, former Evidence Act s.25)Statement before magistrate under s.183 admissible

Where it is used

Interview questions

Common mistakes

Related topics

Police organisation and administration in India · Forensic science and the crime scene · Cyber crime · Criminal trial procedure and the law of evidence (BSA, 2023) · Victim rights, compensation and legal aid · Custodial violence, human rights and police accountability

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