Criminal Investigations: Deaths, Assaults, Poisoning, Accidents

An unnatural death triggers a fixed sequence. The Station House Officer records the information as an FIR under BNSS 2023 Section 173, then conducts an inquest under BNSS Section 194 at the scene. The inquest panchnama records position of body, injuries visible to the naked eye, weapons, ligature, environment and witness statements. Where the death is of a woman within seven years of marriage, in police custody, or in suspicious circumstances, BNSS Section 196 mandates inquiry by an Executive Magistrate rather than the police officer. The body then goes for post-mortem to the nearest medico-legal autopsy centre (AIIMS Delhi, KEM Mumbai, JJ Hospital, GMC casework centres in state capitals).

The substantive offence sits in BNS 2023 Chapter VI. Section 100 defines culpable homicide; Section 101 defines murder; Section 103 prescribes punishment for murder (death or life imprisonment plus fine); Section 105 punishes culpable homicide not amounting to murder. Exceptions to murder (grave and sudden provocation, private defence, public servant exceeding power, sudden fight, consent) carry forward from IPC 300 into BNS 101 exceptions. Section 106 covers death by rash or negligent act not amounting to culpable homicide, with sub-section (2) carving out hit-and-run.

Dowry death is the highest-frequency unnatural-death MCQ. BNS Section 80 retains the IPC 304B definition: death of a woman within seven years of marriage by burns, bodily injury or otherwise than under normal circumstances, with cruelty or harassment for dowry soon before death. Punishment is minimum seven years extending to life. The evidentiary presumption sits in BSA 2023 Section 117 (formerly IEA Section 113B): once the prosecution proves cruelty soon before death, the court shall presume the husband or relative caused the dowry death. Pawan Kumar v. State of Haryana (1998 and 2001) and the Rajbir alias Raju (2011) directions of the Supreme Court remain the standard reading.

Suicide under BNS Section 108 punishes abetment of suicide; the older Section 309 attempt-to-suicide debate is now framed by the Mental Healthcare Act 2017 Section 115, which presumes severe stress and bars prosecution in most cases. For the death-scene investigator the suicide question turns on the medico-legal post-mortem (ligature mark above thyroid for hanging, salivary dribble), the suicide note in handwriting, and the absence of defence injuries.

Dying declarations under BSA 2023 Section 26 (IEA Section 32(1)) are crucial in burn deaths. The fit-state certificate by the medical officer, the questions in the victim's language and the absence of tutoring are the three things courts test. Laxman v. State of Maharashtra (2002, Constitution Bench) held that a dying declaration not recorded by a magistrate is admissible if found voluntary and reliable. Hema Mishra v. State of UP (2014) reiterated that the doctor's certification and verbatim recording carry weight.

India anchor. AIIMS Delhi Department of Forensic Medicine, KEM Hospital Mumbai and JJ Hospital Mumbai run the busiest medico-legal autopsy services in the country. Inquest panchnama formats are standardised by the State CIDs; Delhi Police uses Form 25.35(1) for inquest under the old code, now realigned to BNSS Form A.

Assault investigations cover the spectrum from simple hurt to attempted murder. BNS 2023 Section 114 defines hurt; Section 115 prescribes punishment for voluntarily causing hurt (up to one year or fine to one thousand rupees or both). Section 116 defines grievous hurt with eight clauses (emasculation, permanent privation of sight or hearing, fracture or dislocation of bone or tooth, hurt endangering life or causing inability to follow ordinary pursuits for twenty days). Section 117 punishes grievous hurt; Section 118 covers hurt by dangerous weapons or means including acid attack, and Sections 124 and 125 carry the acid-attack-specific provisions (10 years to life imprisonment).

The investigation is built on the medico-legal report (MLR) prepared at the casualty by the duty doctor on the prescribed state format. The MLR records the alleged history, time and place of incident, type of weapon alleged, examination findings (each injury numbered with site, size, shape, edges, surrounding skin and age), and the opinion on the nature of injury (simple or grievous, weapon class, age). The investigating officer attaches the MLR to the case diary and forwards weapons recovered to the FSL under BNSS 176.

For Paper 2 the age of injury table is examinable: red and bleeding (0 to 24 hours), red with scab (1 to 3 days), reddish-brown scab (4 to 7 days), brown scab falling (1 to 2 weeks), pink scar (2 to 4 weeks), white scar (months). Antemortem versus postmortem injuries are distinguished by vital reaction: gaping, bleeding, retraction of edges, inflammatory cells and clot formation only in antemortem injuries.

Defence wounds on the forearms, palms and back of hands are pathognomonic of a victim resisting an armed assault and are routinely photographed before suturing. Attempt to commit murder is BNS Section 109 and attempt to commit culpable homicide is BNS Section 110; abetment is BNS Sections 45 to 60 with the punishment provisions following the abetted offence. BNS Sections 111 to 113 cover organised crime, terrorism and offences by groups.

India anchor. The state-level Medico-Legal Manuals of Delhi, Maharashtra and Tamil Nadu standardise the MLR proforma. The CFSL Chandigarh Biology Division does most of the assault-case bloodstain and weapon-tissue work for northern states; FSL Madiwala Bengaluru does the same for the south.

Sexual-offence investigation is the most protocol-heavy block in this topic. The substantive offences sit in BNS 2023 Sections 63 to 71. Section 63 defines rape (carrying forward the post-Nirbhaya IPC 375). Section 64 prescribes punishment for rape (minimum ten years extending to life). Section 65(1) punishes rape of a woman under sixteen years (minimum twenty years extending to life). Section 65(2) punishes rape of a woman under twelve years (minimum twenty years extending to life or death after the Criminal Law Amendment Act 2018). Section 66 punishes rape causing death or persistent vegetative state. Section 70(1) is gang rape with a minimum of twenty years. Section 71 punishes repeat offenders.

For victims below eighteen the Protection of Children from Sexual Offences Act 2012 (POCSO) governs. POCSO is gender-neutral as to victim, mandates reporting by any person aware of the offence (Section 19), in-camera trial in a Special Court (Sections 28 and 37), examination of the child within 24 hours by a woman doctor at the place of the child's choice (Section 27), and presumption of culpable mental state of the accused (Section 30). The POCSO Amendment 2019 added the death penalty for aggravated penetrative sexual assault.

The medical examination is governed by the Ministry of Health and Family Welfare Guidelines and Protocols 2014 titled "Medico-legal care for survivors of sexual violence". The protocol mandates: informed written consent on the prescribed format, examination in a private room by a trained medical officer (woman doctor preferred), history including last consensual intercourse and bathing or douching, head-to-toe examination, genital and per-rectal examination as clinically indicated, sample collection into a sealed Sexual Assault Forensic Evidence (SAFE) kit with chain of custody. The 2014 protocol explicitly bans the per-vaginum two-finger test and the recording of comments on past sexual conduct. The Goa Government's Modified Goa Medical Protocol (1996, updated) was the early Indian template that fed into the 2014 national guidelines.

Lillu @ Rajesh v. State of Haryana (2013, Supreme Court) held that the two-finger test violates the right to privacy and dignity of the rape survivor under Article 21 and cannot be used to determine consent. State of Jharkhand v. Shailendra Kumar Rai (2022) reiterated the ban and held that any medical professional conducting the test will be held guilty of misconduct. BSA 2023 Section 120 (carrying forward IEA Section 53A) bars evidence of the victim's previous sexual experience to prove consent. BSA 2023 Section 154 (IEA 146 proviso) bars the same line of cross-examination.

BNSS procedural overlay. Recording of statement of the rape victim under BNSS Section 183 is by a woman magistrate where practicable, with audio-video recording. Trial completion within two months from filing of chargesheet is the statutory target. The Nirbhaya case (Delhi 2012) led to the Criminal Law Amendment Act 2013 (Justice Verma Committee) which created Sections 326A, 326B, 354A to 354D, 376A to 376E in the IPC; these have been folded into BNS 2023 with renumbering.

India anchor. The One Stop Centre Scheme under the Ministry of Women and Child Development, the 112 emergency helpline and the NIRBHAYA Fund anchor the survivor-support side; the CFSL DNA Division and SFSL DNA units handle SAFE-kit analysis. The Hyderabad CCMB has supported state FSLs in difficult DNA casework.

Poisoning is a special species of unnatural death where the substantive offence rides on BNS hurt or homicide provisions (Sections 117, 119, 120 for hurt by poison; Sections 100 to 105 where death follows). The investigation hinges on viscera collection at autopsy under BNSS Section 194 and forwarding to the Chemical Examiner / FSL Toxicology Division.

The standard viscera set on the post-mortem requisition is: stomach with contents, upper part of small intestine with contents, about 250 g of liver, half each of kidneys, spleen, brain, about 30 ml of blood (preserved in sodium fluoride and potassium oxalate), urine, bile. The preservative is saturated solution of common salt (saline) for general viscera; rectified spirit is used where alcohol or volatile poisons are the suspected agent and saturated salt for everything else. Form 21 of the Chemical Examiner is the standard forwarding requisition in most states; viscera bottles are sealed with the autopsy surgeon's seal, sample seal is sent separately, and the chain of custody is logged in the police case diary.

Common Indian poisons for the Paper 2 question are predictable. Aluminium phosphide (Celphos, Quickphos) is the leading agrochemical suicide poison in north India; tablets release phosphine gas with a garlic odour, post-mortem shows haemorrhagic gastritis, the silver nitrate paper test bedside is positive. Organophosphate insecticides (parathion, malathion, chlorpyrifos) inhibit acetylcholinesterase, present with the SLUDGE syndrome (salivation, lacrimation, urination, defecation, GI cramps, emesis) and miosis; antidote is atropine plus pralidoxime. Oleander (Cerbera odollam, Thevetia peruviana) is a Kerala and coastal-belt favourite, cardiac glycoside, post-mortem shows non-specific cardiac findings, identification is by HPLC of kernel in stomach contents.

Other India-relevant agents: datura (Datura stramonium) seeds in food, anticholinergic delirium, common in highway robbery cases; arsenic trioxide as a chronic homicidal poison detectable in hair and nails by AAS and the Reinsch test; carbon monoxide in winter coal-brazier deaths, post-mortem cherry-red lividity, COHb above 50 percent confirms; opioids and methanol in hooch tragedies (Gujarat 2009, Bihar 2016, Tamil Nadu 2023 spurious-liquor outbreaks).

Routes of administration examinable in MCQs are oral (commonest), inhalation (CO, phosphine), injection (insulin, succinylcholine), topical (organophosphate absorption through skin) and per-rectal. Post-mortem chemistry in poisoning includes determining vitreous humour potassium for time of death and blood glucose for insulin homicide cases. The bullet under "drug metabolism and metabolite identification" in Unit V continues this thread.

India anchor. The CFSL Hyderabad Toxicology Division and CFSL Chandigarh run the largest viscera caseloads; state FSLs at Madiwala (Bengaluru), Sagar (MP) and Junga (HP) handle bulk casework. The Chemical Examiner's report under BSA 2023 Section 329 (formerly CrPC 293) is admissible without examining the chemist in court, subject to the court's discretion to summon.

Road traffic accidents (RTAs) are the single largest source of unnatural death in India, with the Ministry of Road Transport and Highways reporting over 1.5 lakh fatalities a year. The substantive offence is BNS 2023 Section 106: sub-section (1) punishes causing death by any rash or negligent act not amounting to culpable homicide with up to five years and fine; sub-section (2) carves out the hit-and-run scenario where the driver fails to report to a police officer or magistrate soon after, with up to ten years and fine. BNS Section 281 punishes rash driving on a public way with up to six months or fine to one thousand rupees or both.

The procedural overlay is the Motor Vehicles Act 1988. Section 134 requires the driver to take the injured to the nearest hospital and report to the police within 24 hours; Section 187 prescribes punishment for failure to comply. Section 161 establishes the hit-and-run compensation scheme. Section 166 governs the Motor Accident Claims Tribunal (MACT) compensation petition. Insurance under Section 146 is mandatory third-party cover.

Scene reconstruction is the forensic content the syllabus tests. The investigating officer prepares the First Accident Report (FAR) at the scene; the Final Form / Motor Final Report (MFR) is filed at chargesheet stage. Field documentation includes total station or measuring-wheel scene plan, photographs of the vehicles, victims and roadway, recovery of debris, skid-mark measurements and tyre impressions.

Skid marks quantify pre-impact braking. The classical reconstruction formula is v = sqrt(2 mu g d) where mu is the coefficient of friction (dry asphalt 0.7, wet 0.4, gravel 0.5), g is 9.81 m per second squared, and d is the skid length in metres. Yaw marks indicate cornering loss of control; scuff marks indicate side-slip; gap skids indicate ABS or pumping.

Paint transfer between vehicles or from vehicle to victim is class evidence linking the suspect vehicle to the scene. Cross-section microscopy at the FSL identifies layer sequence (primer, base coat, clear coat); FTIR identifies binder type; PLM and SEM-EDX identify pigments. Glass fragments from broken headlamps and windscreens are compared by refractive index (GRIM 3 method) and elemental composition (LA-ICP-MS). Tyre impressions in mud or dust are cast with dental stone and class-matched to make, model and width.

The medical side runs in parallel. The medico-legal post-mortem records pattern injuries: bumper injury to the calf, bonnet impact to the thigh, windscreen wounds to the head, secondary fall injury when the body is thrown. Brain stem injury at the foramen magnum is a frequent immediate cause of death in motorcycle riders without helmets. Crush injuries of the chest with multiple rib fractures and flail chest point to run-over impact.

India anchor. Bengaluru Traffic Police runs Asia's largest CCTV-fed traffic management; Mumbai and Delhi use Intelligent Traffic Management Systems for evidentiary captures. The Indian Roads Congress (IRC) SP 88 lays down accident-investigation guidelines; the Sundar Committee Report 2007 and the Supreme Court Committee on Road Safety (Justice Radhakrishnan, 2014) drive enforcement priorities. The Salman Khan (2002 Bandra hit-and-run) and Sanjeev Nanda (BMW 1999) cases set the modern jurisprudence on rash-driving fatalities and witness-tampering issues.

Every case type above runs the same procedural spine. BNSS 2023 Section 173 governs information of a cognisable offence and the registration of FIR. Sub-section (1) proviso codifies the zero-FIR practice: information can be recorded at any station regardless of jurisdiction, then transferred. The FIR must be read over to the informant and a free copy given. e-FIR is permitted for offences punishable up to three years with verification.

BNSS Section 176 is the heart of forensic India. Sub-section (3) mandates that for offences punishable with seven years or more, the forensic expert shall visit the scene of crime for evidence collection. This was a major procedural shift from CrPC 1973 and operationalises the National Forensic Infrastructure Enhancement Scheme.

BNSS Section 193 is the chargesheet provision. Sub-section (3)(ii) sets the time limit: 60 days for offences punishable up to 10 years and 90 days for offences punishable with death, life or more than 10 years (carrying forward CrPC 167(2)). The chargesheet must be filed in electronic form with all forensic and electronic evidence attached.

BSA 2023 Section 39 governs expert opinion. Sub-section (2) explicitly recognises information furnished by an expert as evidence. The forensic analyst, the autopsy surgeon and the chemical examiner are the three categories of expert routinely deposed. The expert's report is exhibited and the expert is cross-examined under BSA Section 144 (formerly IEA 137) on chief, cross and re-examination.

Aarushi Talwar (Noida 2008) and Sheena Bora (Mumbai 2012) are recent case studies the NTA examiner is likely to weave into match-the-following items: Aarushi for the chain-of-custody failures at a domestic homicide scene, Sheena Bora for delayed discovery and skeletal-remains identification. The Nirbhaya case (Delhi 2012) is the master case study cutting across sexual offence, criminal assault, vehicular movement of the victim and dying declarations. Hema Mishra v. State of UP (2014) is the dying-declaration anchor; Pawan Kumar v. State of Haryana (1998, 2011) is the dowry-death anchor.

India anchor. The Crime and Criminal Tracking Network and Systems (CCTNS) of the National Crime Records Bureau records all FIRs digitally and links to the National Database of Sexual Offenders (NDSO). CFSL Hyderabad, Chandigarh, Kolkata, Bhopal and Pune, the NFSU campuses (Gandhinagar, Delhi, Goa, Bhopal, Tripura, Manipur) and the state SFSLs/RFSLs operationalise BNSS 176 in the field.