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📚 FMT EXAM PREPARATION - Complete Answer Guide

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1. DNA FINGERPRINTING (10 Marks)

Definition:

Principle:

• Every individual (except identical twins) has a unique DNA sequence
• Certain regions called Variable Number of Tandem Repeats (VNTRs) or Short Tandem Repeats (STRs) vary between individuals
• These are used to create a unique "fingerprint"

Steps/Technique (PCR-Based Method):

1. Collection - Biological sample (blood, semen, hair, saliva, bone)
2. Extraction - DNA extracted from nucleated cells
3. Amplification - PCR (Polymerase Chain Reaction) amplifies specific STR loci
4. Electrophoresis - DNA fragments separated by size on gel
5. Southern Blotting - Transferred to nylon membrane
6. Hybridization - Radioactive probes attach to specific sequences
7. Autoradiography - X-ray film shows banding pattern = DNA profile

Medicolegal Importance:

• Identification of unknown bodies/decomposed remains
• Paternity/Maternity disputes
• Rape cases - semen stains matched to accused
• Mass disaster victim identification
• Immigration disputes
• Exoneration of wrongly accused persons
• Criminal investigation - blood, hair at crime scene

Advantages:

• Extremely sensitive (can work with tiny samples)
• Can use degraded samples
• Nearly 100% accurate

Limitations:

• Expensive
• Requires lab expertise
• Sample contamination can give false results
• Identical twins have same DNA

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2. RIGOR MORTIS (10 Marks)

Definition:

Mechanism (ATP Theory):

• After death → ATP production stops
• Calcium accumulates in muscle fibers
• Actin-myosin cross-bridges form but cannot release (no ATP to break them)
• Result: permanent muscle contraction = stiffness

Onset, Duration, Disappearance:

Order of Appearance (Nysten's Rule):

• Starts from jaw/neck → trunk → upper limbs → lower limbs
• Disappears in same order (jaw first, lower limbs last)

Exceptions to Nysten's Rule:

• Not followed in cases of heat, exertion before death, fever

Factors Affecting Rigor Mortis:

Special Types:

• Cadaveric spasm (Instantaneous rigor): Immediate stiffening at moment of death - seen in drowning, gunshot wounds - great medicolegal importance (person may grip weapon/grass at time of death)
• Heat stiffening: Protein coagulation - muscles hard, shortened
• Cold stiffening: Due to freezing of tissue fat

Medicolegal Importance:

• Estimation of time since death
• Cadaveric spasm helps determine manner of death (suicide vs homicide)
• Helps determine position of body at time of death
• Distinguish from heat stiffening (no true rigor - occurs at all joints)

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3. INTRACRANIAL HAEMORRHAGES (10 Marks)

Classification:

1. Extradural (Epidural) Haemorrhage
2. Subdural Haemorrhage
3. Subarachnoid Haemorrhage
4. Intracerebral Haemorrhage

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1. Extradural Haemorrhage:

• Between skull and dura mater
• Cause: Rupture of Middle Meningeal Artery (temporal bone fracture)
• Classic feature: Lucid interval (patient conscious → loses consciousness)
• Shape: Biconvex/Lenticular on CT scan
• Treatment: Emergency burr hole + evacuation

2. Subdural Haemorrhage:

• Between dura and arachnoid
• Cause: Rupture of bridging veins (cortical veins)
• Types: Acute (<72 hrs), Subacute (3-21 days), Chronic (>21 days)
• Common in: Elderly, alcoholics, trauma
• CT scan: Crescent-shaped hyperdense collection
• Battered Baby Syndrome - classic cause in children

3. Subarachnoid Haemorrhage:

• Between arachnoid and pia mater
• Cause: Berry aneurysm rupture, trauma
• Feature: Worst headache of life ("thunderclap headache")
• Lumbar puncture: Xanthochromia (yellow CSF)
• Medicolegal: Can die suddenly - may be mistaken for homicide

4. Intracerebral Haemorrhage:

• Within brain parenchyma
• Cause: Hypertension, trauma
• Common site: Basal ganglia, internal capsule

Medicolegal Importance:

• Head injury → death → investigation needed
• Subarachnoid hemorrhage can cause sudden death - must rule out foul play
• Extradural - typical traumatic injury
• Subdural in infants → suspect non-accidental injury/child abuse

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4. RECORDING OF EVIDENCE OF WITNESS IN COURT (10 Marks)

Types of Witnesses:

1. Ordinary Witness - gives facts (what they saw/heard)
2. Expert Witness - gives opinion based on expertise (doctor = medical expert)

Doctor as Expert Witness:

• Under Section 45, Indian Evidence Act - expert opinion is admissible
• Doctor can give opinion on: cause of death, nature of injury, mental state, intoxication

Procedure of Recording Evidence:

• Witness examined by the party who called them
• Doctor states qualifications, presents findings

• Examined by the opposite party's lawyer
• Purpose: test accuracy, expose weaknesses
• Doctor must answer honestly, remain calm

• By the original party after cross-examination
• To clarify points raised in cross-examination

Deposition:

• Written statement of evidence given in court
• Must be signed by witness
• Becomes permanent court record

Rules for Doctor as Witness:

• Speak clearly and concisely
• Avoid medical jargon
• Do not express opinion outside expertise
• Be impartial - "amicus curiae" (friend of court)
• Refer to notes/reports if needed
• Can refuse to answer only if answer would incriminate self

Subpoena/Summons:

• Legal order to appear in court
• Doctor must attend when summoned
• Failure = contempt of court

Types of Evidence:

• Oral evidence: Spoken testimony
• Documentary evidence: Medical reports, certificates
• Material evidence: Exhibits (weapon, clothing)

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5. INDICATIONS & OBJECTIVES OF MEDICOLEGAL AUTOPSY (10 Marks)

Definition:

Types:

1. Medicolegal/Forensic Autopsy - ordered by law/court
2. Clinical/Pathological Autopsy - for academic/clinical purposes

Legal Authority:

• Ordered by Magistrate under Section 174/176 CrPC (now BNSS)
• Performed by Medical Officer (preferably forensic pathologist)

Indications (When Medicolegal Autopsy is Ordered):

• Homicide (murder)
• Suicide
• Accidental death (road accidents, drowning, burns, fall)
• Death due to weapons/injuries

• Sudden death in apparently healthy person
• Death within 24 hours of hospital admission (in suspicious cases)

• Death in jail/police custody
• Death in mental asylum

• Suspected poisoning
• Death following medical/surgical procedure (if negligence suspected)
• Death of unknown cause

Objectives of Medicolegal Autopsy:

1. Determine cause of death (immediate, underlying, contributing)
2. Determine manner of death (homicide, suicide, accident, natural)
3. Estimate time since death
4. Identify the deceased
5. Establish nature and severity of injuries
6. Collect evidence (bullets, poisons, fibers, biological samples)
7. Determine if injury occurred ante-, peri-, or post-mortem
8. Provide court evidence through postmortem report
9. Help police investigation
10. Exonerate innocent suspects

Postmortem Report includes:

• External examination findings
• Internal examination findings
• Cause of death opinion
• Samples collected

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6. BLOOD STAINS AT CRIME SCENE (10 Marks)

Importance:

Steps in Analysis:

1. Kastle-Meyer Test - Phenolphthalein + H₂O₂ → pink color
2. Luminol Test - Detects even invisible/washed blood (chemiluminescence)
3. Benzidine Test (Adler's test) - blue color (now rarely used, carcinogenic)
4. Leuco-malachite green test

1. Precipitin Test (Ouchterlony) - confirms human blood
2. Takayama Test - hemochromogen crystals (pyridine hemochrome)
3. Teichmann Test - hemin crystals (salt + acetic acid → rhomboid crystals)

• ABO system - most common
• Even dried blood can be grouped
• Secretor status - 80% population secrete blood group antigens in body fluids

Bloodstain Pattern Analysis (BPA):

Collection of Blood Evidence:

• Wet blood: Collect on sterile swab, air dry
• Dry blood: Scrape, collect in paper envelope
• Never use plastic bags (promotes putrefaction)
• Label, seal, maintain chain of custody

Medicolegal Importance:

• Identifies species (human/animal)
• Identifies blood group (link to accused/victim)
• DNA profile - definitive identification
• BPA helps reconstruct crime scene
• Determines position of victim during attack

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7. TRUTH SERUM (10 Marks)

Definition:

Drugs Used:

1. Sodium Amytal (Sodium Amobarbital) - most commonly used
2. Sodium Pentothal (Thiopental sodium) - "original truth serum"
3. Scopolamine - earliest used
4. Midazolam
5. Alcohol (in crude sense)

Mechanism:

• These are CNS depressants (barbiturates/benzodiazepines)
• Reduce activity of prefrontal cortex → decreased inhibition
• Person loses ability to consciously construct lies
• Acts on GABA receptors → sedation

Procedure (Narcoanalysis):

• Drug given IV slowly until patient in twilight state (cooperative but drowsy)
• Questions asked in this semi-conscious state
• Responses recorded

Legal Status in India:

• Supreme Court ruling (Selvi vs State of Karnataka, 2010):
  • Narcoanalysis, Brain mapping, Polygraph cannot be conducted without consent
  • Involuntary administration violates Article 20(3) (right against self-incrimination)
  • Voluntary narcoanalysis results can be used
  • Results are NOT admissible as evidence directly in court

Limitations:

• Person can still lie in semi-conscious state
• Highly susceptible to suggestion → false confessions
• Not scientifically reliable
• Medical risks: respiratory depression, allergy

Other Interrogation Techniques:

• Polygraph (Lie detector): Measures physiological changes (BP, pulse, respiration, GSR)
• Brain Electrical Oscillation Signature (BEOS)
• P300 Brain Fingerprinting: Detects recognition response in brain

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8. DELUSIONS & MEDICOLEGAL IMPORTANCE (10 Marks)

Definition:

Characteristics (4 Features):

1. False belief
2. Fixed (unshakeable despite evidence)
3. Not culturally shared
4. Not explained by other psychiatric illness

Types of Delusions:

Medicolegal Importance:

• Person with delusion may commit violent crime based on false belief
• McNaughton Rules - if person did not know nature/wrongfulness of act due to disease of mind → not guilty by reason of insanity
• Delusion of persecution → may attack "persecutor"
• Delusion of jealousy → may kill spouse (Othello syndrome → homicide)

• Person making a will must have sound mind
• Delusion may invalidate a will if it directly affected the will's provisions

• Contracts made during delusional state may be voidable

• If person cannot understand proceedings due to delusions → unfit to stand trial

• Delusional person may require legal guardian

• Delusions can be ground for divorce/nullity of marriage

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9. NEGATIVE VISCERA REPORT - CAUSES (10 Marks)

Definition:

Causes of Negative Viscera Report:

1. Volatilization of poison during preservation/transport (volatile poisons - chloroform, ether, CO)
2. Decomposition of poison - some poisons degrade quickly after death
3. Insufficient quantity - sub-lethal amount absorbed, small residue remains
4. Improper preservation - wrong preservative used (e.g., using saturated NaCl instead of rectified spirit)
5. Insufficient quantity of viscera sent
6. Improper technique used in lab
7. Poison not searched for - if wrong poison suspected, different test not done

1. Rapid absorption - poison fully absorbed into tissues, none left in GIT
2. Rapid excretion - excreted via kidneys before death
3. Rapid metabolism - biotransformation converts poison to metabolites (test for metabolite not done)
4. Redistribution - poison moved to tissues (brain, bone) not routinely examined

1. Vegetable alkaloids (strychnine) - destroyed by putrefaction
2. Biological toxins (snake venom, botulinum) - specific tests not routinely done
3. Gaseous poisons (CO, HCN) - escape during preservation
4. Insulin - difficult to detect, rapidly metabolized
5. Potassium - normal body constituent, levels equalize after death

1. Tampered/substituted sample
2. Delay in sending viscera
3. Inadequate amount of tissue

Medicolegal Significance:

• Negative report does NOT rule out poisoning
• Court cannot acquit solely on negative report
• Must consider clinical history, circumstances, other evidence
• Other viscera (brain, bone marrow) should be examined

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10. PAROUS vs NULLIPAROUS UTERUS (Postmortem) (10 Marks)

Additional Postmortem Signs of Parity:

• Linea nigra - midline dark line on abdomen
• Striae gravidarum - stretch marks on abdomen
• Breast changes - larger, pendulous
• Perineal scars from delivery
• Vaginal rugae - less prominent

Medicolegal Importance:

• Determine if deceased woman ever had child (important in infanticide cases)
• Helps in identification of unknown female body
• Important in cases of abortion/criminal abortion deaths

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11. AUTOPSY FINDINGS IN SMOTHERING (10 Marks)

Definition:

External Findings:

1. Face: Cyanosis, congestion
2. Lips: Contusions, abrasions on inner surface (pressed against teeth)
3. Gums/Teeth: Inner surface of lips torn, bruised
4. Perioral region: Fingernail marks, contusions (if hand used)
5. Nostrils: Abrasions, contusions
6. Skin: Signs of struggle - scratches, bruises
7. Hands/Fingers of victim: Defense wounds (if struggled)
8. Petechial hemorrhages: On face, conjunctivae, sclera

Internal Findings:

1. General asphyxia signs:
   • Visceral congestion (all organs congested)
   • Petechial hemorrhages - on lungs, pleura, pericardium (Tardieu's spots)
   • Right heart distension
   • Dark, fluid blood
2. Lungs: Congested, edematous, overinflated initially
3. Hyoid bone: Usually intact (unlike throttling)
4. Brain: Congested, edematous
5. Foreign material: Fibers in airway (from pillow/cloth)

Features Suggesting Smothering:

• Injuries to lips (inner surface bruised against teeth) - most important
• Perioral bruising
• Fibers/foreign material in airway
• No injury to neck (differentiates from strangulation)
• Evidence of struggle

Medicolegal Importance:

• Common method of infanticide (soft pillow on baby face)
• May leave few marks - difficult to diagnose
• In infants: may be confused with SIDS (Sudden Infant Death Syndrome)
• Must examine inner lips carefully

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12. HURT AND ITS TYPES (10 Marks)

Definition (IPC Section 319 / BNS):

Simple Hurt (Section 319 IPC):

• Punishment: Up to 1 year imprisonment + fine

Grievous Hurt (Section 320 IPC):

1. Emasculation (depriving male of power of procreation)
2. Permanent privation of sight of either eye
3. Permanent privation of hearing of either ear
4. Privation of any member or joint
5. Destruction or permanent impairing of any member or joint
6. Permanent disfiguration of head or face
7. Fracture or dislocation of a bone or tooth
8. Any hurt which endangers life or causes severe pain/inability to follow ordinary pursuits for 20+ days

Differences:

Medicolegal Importance:

• Doctor's role: Certify whether hurt is simple or grievous
• Medico-legal certificate (MLC) issued
• Important for determining charges against accused
• Fracture = grievous (even if healed) - must certify properly
• Endangering life - even if recovered, still grievous

Instruments Used:

• Degree of hurt depends on weapon, force, site, age, health of victim

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13. BATTERED BABY SYNDROME (10 Marks)

Definition:

Features / Clinical Presentation:

• Inconsistent history (injury explained doesn't match injury found)
• Delayed presentation to hospital
• Multiple hospitals visited
• Parents show unusual calmness
• History changes on repeated questioning

1. Bruises at unusual sites (buttocks, back, face, ears)
2. Bruises of different ages (multiple episodes of abuse)
3. Human bite marks
4. Cigarette burns - circular burns
5. Belt marks, rope marks
6. Torn frenulum (from forced feeding)
7. Alopecia (hair pulled out)
8. Black eye (periorbital hematoma)

1. Subdural hematoma - most common intracranial injury (shaking)
2. Retinal hemorrhages (shaken baby syndrome)
3. Intracranial hemorrhages
4. Abdominal injuries - liver/spleen laceration

1. Multiple fractures of different ages (most diagnostic)
2. Metaphyseal chip fractures (corner fractures) - pathognomonic
3. Posterior rib fractures
4. Spiral fractures of long bones (twisting)
5. Periosteal reaction

• Violent shaking → subdural hematoma + retinal hemorrhages without external head injury
• Classic triad: subdural hematoma + retinal hemorrhages + encephalopathy

Medicolegal Importance:

• Mandatory reporting to authorities
• Most abusers are parents/step-parents/caregivers
• Doctor must document all injuries
• Skeletal survey (X-ray entire body) must be done
• Must differentiate from osteogenesis imperfecta, bleeding disorders
• Doctor has duty to report - not doing so may be negligent

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14. PARAPHILIAS - TYPES & SADISM (10 Marks)

Definition:

Classification/Types:

SADISM (Detail):

• Person gets sexual excitement from causing pain/suffering to partner
• Can be psychological or physical
• May be consensual (S&M play) or non-consensual (criminal)
• Can escalate to serious violence

• Inflicts pain with pleasure
• May use instruments (whips, ropes, knives)
• Fantasizes about torture, domination
• Extreme form = Lust murder (Erotophonophilia)

• Sexual pleasure from killing
• Victim usually mutilated
• Body may show bizarre injuries (genital mutilation, biting)
• May involve dismemberment

1. Lust murder investigation
2. Injuries on victim's body suggest sadistic act
3. May mimic homicide initially
4. Bite marks on victim - key evidence
5. Sadomasochistic activities can lead to accidental death
6. Criminal responsibility - if act non-consensual = rape/assault charges

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15. SIGNS OF ASPHYXIA (10 Marks)

Definition:

Signs of Asphyxia:

1. Cyanosis:
   • Bluish discoloration of skin, lips, fingernails, face
   • Due to deoxygenated hemoglobin (>5g/dL)
2. Petechial Hemorrhages (Tardieu's Spots):
   • Pinpoint hemorrhages on: conjunctivae, sclera, face, eyelids
   • Due to rupture of small vessels from increased venous pressure
   • Pathognomonic of asphyxia
3. Congestion of Face:
   • Florid, congested, puffed face
   • Especially in compression of neck
4. Edema of Face
5. Protrusion of Tongue
6. Prominent Eyes (Proptosis)

1. Visceral Congestion:
   • All organs (brain, lungs, liver, kidneys) congested with blood
   • Dark, fluid, unclotted blood throughout
2. Right Heart Distension:
   • Right side of heart dilated and full of blood
   • Left side relatively empty
3. Tardieu's Spots:
   • Petechial hemorrhages on pleural surface of lungs, pericardium, under scalp
4. Pulmonary Changes:
   • Lungs: voluminous, congested, edematous
   • Frothy fluid in airways
   • Lung "pits" on compression (emphysema aquosum in drowning)
5. Dark Fluid Blood:
   • Blood remains dark (deoxygenated) and fluid (fibrinolysis)
   • Postmortem clots: "chicken fat clot" (yellow) on top + dark red clot below
6. Cerebral Congestion/Edema

Negative Pressure Sign of Paltauf:

• Seen in drowning - pale, watery areas on lungs from rupture of alveoli

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16. AUTOPSY FINDINGS IN STARVATION DEATH (10 Marks)

Definition:

External Findings:

1. Extreme emaciation - all subcutaneous fat absent
2. "Skin and bones" appearance
3. Skin - dry, wrinkled, inelastic, hanging loose
4. Skin color - pale, yellowish, muddy
5. Hair - thin, sparse, easily plucked, depigmented
6. Edema - dependent edema (kwashiorkor type) or absent
7. Eyes - sunken
8. Abdomen - scaphoid (sunken) or distended
9. Bedsores/Pressure sores - from prolonged lying
10. Muscle wasting - generalized

Internal Findings:

• Subcutaneous fat - completely absent
• Omental/mesenteric fat - absent
• Fat replaced by serous fluid = Serous Atrophy of Fat

• Small, atrophied
• Brown atrophy of heart muscle
• Lipofuscin pigment in myocardial cells (brown spots)

• Small, shrunken
• Fatty change may occur
• "Nutmeg liver" pattern

• Wasted, atrophied, pale

• Empty, collapsed
• Atrophied mucosa
• No food content

• Osteoporosis - weak, porous
• Fractures possible

• Atrophied

• Atrophied (stress involution)

• Atrophied

• Usually relatively preserved (last to be affected)

Cause of Death in Starvation:

• Cardiac failure (atrophied heart)
• Intercurrent infection (pneumonia, TB) - due to immunosuppression
• Electrolyte imbalance
• Hypothermia

Medicolegal Importance:

• Child neglect, elder abuse cases
• Prisoners/detainees
• Proof of neglect/cruelty required
• Certificate of starvation as cause of death

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17. ORGANOPHOSPHATE POISONING & TREATMENT (10 Marks)

Definition:

Mechanism:

• OP compounds irreversibly bind to Acetylcholinesterase (AChE)
• → Accumulation of Acetylcholine (ACh) at nerve synapses
• → Overstimulation of muscarinic and nicotinic receptors

Clinical Features:

• D - Diarrhea
• U - Urination
• M - Miosis (pin-point pupils - most important sign)
• B - Bradycardia, Bronchospasm, Bronchorrhea
• E - Emesis
• L - Lacrimation
• S - Salivation, Sweating

• Muscle twitching/fasciculations
• Tachycardia (can mask bradycardia)
• Weakness
• Hypertension
• Flaccid paralysis (late)

• Anxiety, restlessness
• Seizures
• Coma
• Respiratory failure (main cause of death)

Diagnosis:

• Plasma cholinesterase level (reduced)
• RBC cholinesterase (more specific)
• Clinical picture + history

Treatment:

• Airway - intubation if needed
• Breathing - O₂, ventilation
• Circulation - IV access

• Remove clothing
• Wash skin thoroughly with soap and water
• Gastric lavage (if oral ingestion, within 1-2 hours)
• Activated charcoal

• Blocks muscarinic receptors
• Dose: 2-4 mg IV repeated every 5-10 minutes
• Target: Drying of secretions (not pupil size)
• Large doses may be required (up to 20-100 mg in severe cases)
• Continue until bronchospasm/secretions controlled = Atropinization

• Reactivates acetylcholinesterase
• Must be given early (before "aging" occurs within 24-48 hours)
• Dose: 1-2g IV over 15-30 minutes, then infusion
• Effective against nicotinic symptoms (muscle weakness)
• Works alongside atropine

• For seizures (diazepam IV)

Cause of Death:

• Respiratory failure (bronchospasm + excessive secretions + paralysis of respiratory muscles)

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18. HALLUCINATION (10 Marks)

Definition:

Types of Hallucinations:

• Hearing voices, sounds, music
• Types: Elementary (noises), Verbal (voices), Second person, Third person
• Running commentary - voice describes patient's actions (diagnostic of schizophrenia)
• Thought echo (Gedankenlautwerden) - thoughts spoken aloud

• Seeing things not present
• Common in: delirium, alcohol withdrawal, drug intoxication, temporal lobe epilepsy

• Feeling of insects crawling on skin = Formication (cocaine psychosis, delirium tremens)

• Smelling non-existent odors
• Often unpleasant smells
• Common in: temporal lobe epilepsy, schizophrenia

• Tasting non-existent substances
• Often associated with olfactory hallucinations

• False sensation of body movement or internal organs

• Occur while falling asleep (normal phenomenon, also in narcolepsy)

• Occur while waking up

Special Types:

• Lilliputian hallucinations: Seeing small people/objects (alcohol, fever)
• Autoscopic hallucinations: Seeing one's own body (doppelganger)
• Extracampine: Outside normal sensory field

Associated Conditions:

Medicolegal Importance:

1. Criminal responsibility - person acting on hallucinations may not be responsible
2. Fitness to stand trial - if actively hallucinating
3. Testamentary capacity - hallucinations may invalidate will
4. Insanity defense - McNaughton Rules apply
5. Driving/occupational fitness - must be assessed
6. Malingering - some may fake hallucinations to escape punishment

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19. STRANGULATION AND ITS TYPES (25 Marks)

Definition:

Mechanism of Death:

1. Airway obstruction - trachea compressed
2. Venous obstruction - jugular veins compressed → venous congestion → cerebral hypoxia
3. Arterial obstruction - carotid arteries compressed → cerebral ischemia
4. Vagal inhibition - pressure on carotid sinus → reflex cardiac arrest (most rapid)

Types of Strangulation:

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A. LIGATURE STRANGULATION

• Horizontal / slightly oblique (unlike hanging - oblique, upward)
• Complete circle around neck
• Multiple marks if ligature applied multiple times
• Located at or below thyroid cartilage
• Groove may show pattern of ligature
• Abrasions, bruising around groove

• Ligature mark (as above)
• Petechial hemorrhages on face, conjunctivae
• Cyanosis, congestion of face
• Protruding tongue
• Petechiae on upper face/eyelids

• Neck dissection findings:
  • Hemorrhage in strap muscles of neck
  • Hemorrhage around ligature groove
  • Hyoid bone fracture (less common than in throttling)
  • Thyroid cartilage fracture
  • Hemorrhage in thyroid gland
• Visceral congestion
• Tardieu's spots on lungs, pleura
• Right heart distension
• Dark fluid blood

• Usually homicide
• Suicide by ligature strangulation is rare but possible
• Rarely accidental (industrial accident, playful strangulation)

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B. THROTTLING (Manual Strangulation)

• Fingermark bruises on neck:
  • One side: thumb print
  • Other side: multiple finger prints
  • If both hands used: bilateral multiple marks
• Fingernail crescent marks
• Bruising, abrasions on neck
• Face: Congested, cyanotic, petechiae
• Protruding tongue

• Hemorrhage in neck muscles (strap muscles)
• Hyoid bone fracture (most common in throttling, due to direct pressure)
• Thyroid cartilage fracture
• Laryngeal fractures
• Hemorrhage around larynx
• Visceral congestion, Tardieu's spots

• ALWAYS SUSPECT HOMICIDE
• If hyoid fractured + fingermarks = throttling
• Single attacker or multiple (bilateral marks vs unilateral)
• Victim may struggle → defense wounds

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C. MUGGING (Arm-lock Strangulation)

• Used in wrestling, police restraint
• Death from: carotid compression → cerebral ischemia, vagal inhibition
• May leave few external marks
• Rarely, petechiae and internal hemorrhages

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D. BANSDOLA

• Traditional Indian method (used in thuggee murders)
• Two sticks placed either side of neck and twisted against each other
• Compression of neck vessels

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Differences: Ligature Strangulation vs Throttling vs Hanging:

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General Signs of Strangulation at Autopsy:

1. Mark of violence on neck
2. Petechial hemorrhages above level of compression
3. Internal neck hemorrhages
4. Laryngeal/hyoid fractures
5. General asphyxia signs

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20. INJURY - DEFINITION, TYPES, ANTE vs POSTMORTEM (25 Marks)

Definition of Injury:

Classification of Injuries:

1. BLUNT FORCE INJURIES:

• Superficial wound affecting epidermis only
• Types:
  • Scratched/Linear: Sharp point dragged across skin
  • Graze: Sliding contact (road rash)
  • Pressure/Imprint: Blunt object pressed with force (shows pattern - e.g., car bumper, muzzle)
  • Friction: Rubbing - rope burns
• Medicolegal importance:
  • Shows direction of force (epidermis heaps up at far end)
  • Patterned abrasion shows nature of weapon
  • Heals without scar (important)
  • Helps identify time of injury

• Extravasation of blood into tissues from ruptured blood vessels without skin break
• Color changes:
  • Fresh: Red
  • 6-12 hrs: Blue/purple
  • 2-3 days: Green
  • 5-6 days: Yellow
  • 7-10 days: Normal
• Delayed bruise: Deep bruise appears later at surface (fracture site)
• Migrating bruise: May track along tissue planes (e.g., orbital bruise after frontal injury)
• Medicolegal: Approximate dating of injury

• Full thickness tear of skin/tissue by blunt force
• Features:
  • Irregular, ragged edges
  • Tissue bridges across wound
  • Bruising and abrasion of surrounding skin
  • May contain foreign material
• Distinguished from incised wound: lacerations have ragged edges, tissue bridges

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• Length > depth
• Clean, regular edges
• No tissue bridges
• Caused by: knife, razor, glass

• Depth > length
• Caused by: knife, nail, needle

• Heavy sharp weapon (axe, dao)
• Features of both incised + laceration

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ANTEMORTEM vs POSTMORTEM WOUNDS:

Perimortem Wounds:

• Occurring at/around time of death
• May mimic antemortem wounds
• Difficult to distinguish histologically

Vital Reaction:

• Cellular response to injury that confirms injury occurred during life
• Includes: vascular response, inflammatory response, healing
• Tests: Histamine estimation, enzyme histochemistry, PMN count

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21. WEAPON OF OFFENCE - SHARP CUTTING & MEDICOLEGAL ASPECTS (25 Marks)

Definition:

Classification of Sharp Weapons:

1. Knife - most common
2. Razor/Scalpel - very fine edge
3. Glass - fragments
4. Chopper/Axe - also has weight (chop wounds)
5. Sword/Saber

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INCISED WOUNDS (Cut Wounds) - by Sharp Cutting Weapons:

1. Edges: Clean, regular, well-defined
2. Shape: Linear or slightly gaping
3. Length > Depth (distinguishes from stab)
4. No tissue bridges
5. No bruising/abrasion at wound margins
6. Hemorrhage: Profuse (vessels cleanly cut)
7. Wound gapes more if perpendicular to Langer's lines
8. Tailing at ends (wound becomes superficial = "tailing off")
9. Hesitation cuts: Multiple superficial cuts alongside main wound (suicide)
10. Tendon/nerve may be cut cleanly

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STAB WOUNDS (Puncture Wounds) - by Sharp Pointed Weapons:

1. Depth > Length (distinguishes from incised)
2. Edges relatively regular
3. Shape reflects cross-section of weapon:
   • Single-edged knife: one end sharp, one blunt (fish-tail shape)
   • Double-edged: both ends sharp (spindle-shaped)
4. Track in tissues - important to trace direction/depth
5. Wound may be deceptively small externally, severe internally

• Width = blade width
• Length of wound if measured fresh = blade width approximately
• Sharp end = sharp edge of blade
• Blunt end = back of blade (may show bruising)

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CHOP WOUNDS - by Heavy Sharp Weapons (Axe, Dao):

• Features of both incised AND lacerated wound
• Deep, may reach bone
• Bone shows smooth cut mark (unlike fracture)
• Splitting of bone possible
• Heavy hemorrhage

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DEFENSE WOUNDS:

• Injuries on hands, forearms (victim defending against attack)
• Linear cuts on ulnar border of forearm and palm
• Indicates victim was alive and conscious during attack
• Important in homicide vs accident vs suicide distinction

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DIFFERENCES: Incised vs Lacerated vs Stab Wound:

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MEDICOLEGAL ASPECTS of Sharp Cutting Wounds:

• Wound characteristics help identify type of weapon
• Pattern of wound = type of blade

• Antemortem vs postmortem distinction

• Exact site, size, shape, depth, margins, track
• Direction of force
• Describe systematically

• Genital/anal injuries
• Injuries may indicate nature of assault

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22. CONSENT - DEFINITION, TYPES, INFORMED CONSENT (25 Marks)

Definition:

Elements of Valid Consent:

1. Voluntary - free from coercion, undue influence
2. Informed - full disclosure of information
3. Competent - person must be legally and mentally competent
4. Specific - for specific procedure
5. Contemporary - given at appropriate time

Age of Consent:

• 18 years = legal age (India)
• Minor: Parent/guardian consent required
• Emergency: Implied consent operates

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Types of Consent:

• Clearly and explicitly given
• Can be:
  1. Written - for major procedures, surgery (preferred medicolegally)
  2. Oral/Verbal - minor procedures

• Not explicitly stated but inferred from actions/circumstances
• E.g.: Presenting arm for injection, attending clinic
• Emergency implied consent: Unconscious patient in emergency = consent implied

• Assumed patient would consent if they could
• Emergency situations, public health (vaccination programs)

• Given by authorized person on behalf of patient who cannot consent
• Parents for minors
• Guardian for mentally incompetent
• Spouse/family for unconscious (morally, not legally binding in all cases)

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INFORMED CONSENT - Elements:

• Diagnosis - what condition is being treated
• Nature of proposed treatment/procedure - what will be done
• Purpose and expected benefits
• Material risks and complications (even rare if serious)
• Alternative treatments available
• Consequences of no treatment
• Who will perform the procedure
• Anesthesia details if applicable

• Information given in patient's language
• Simple terms, no medical jargon
• Patient must demonstrate understanding

• No force, coercion, manipulation, undue influence
• Patient can ask questions and refuse

• Adult (18+)
• Sound mind (no psychiatric incapacity)
• Not intoxicated
• Not under influence of sedatives at time of signing

• Patient must actively agree (not just passive)

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Standards of Disclosure:

1. Professional Standard: What a reasonable doctor would disclose
2. Reasonable Patient Standard (Prudent Patient): What a reasonable patient would want to know
3. Subjective Standard: What this specific patient would want to know

Exceptions to Informed Consent:

1. Emergency - life-threatening, patient unable to consent
2. Therapeutic Privilege - disclosure would harm patient (rare)
3. Waiver - patient waives right to information
4. Incompetent patient - proxy consent

Consequences of No/Invalid Consent:

• Civil liability (negligence/battery)
• Criminal liability (assault)
• Professional misconduct

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23. SEXUAL DEVIATIONS & EVIDENCE COLLECTION IN ACCUSED (25 Marks)

Sexual Deviations (Paraphilias) - Enumeration:

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EVIDENCE COLLECTION IN ACCUSED OF SEXUAL ASSAULT:

• Section 53A CrPC (now BNSS) - medical examination of accused of rape
• Conducted by Registered Medical Practitioner
• Consent not required for examination of accused (unlike victim)

• Time of alleged act
• Personal hygiene (bath, clothes change since incident)
• Medical history (vasectomy, STI)

1. Age estimation (bone X-rays, secondary sexual characteristics)
2. Height, weight, built
3. Physical signs of struggle - scratches, bruises (from victim's defense)
4. Bite marks on body
5. State of clothing - torn, stains

1. Penis examination:
   • Any injury, abrasion
   • Phimosis/paraphimosis
   • Signs of erection/ejaculation
2. Prepuce/glans: Injuries, smegma, foreign material
3. Urethral discharge - swab
4. Scrotum: Bruises

• Smegma washed away (if recent intercourse)
• Seminal fluid on penis/clothing
• Victim's vaginal fluid/cells on penis (identified by DNA)
• Victim's pubic hair on accused

• Lax anal sphincter
• Funneling of anus
• Loss of normal rugae
• Haemorrhoids, fissures
• (These signs are unreliable and many are now disputed)

• All samples labeled, sealed, signed
• Maintained throughout - essential for court admissibility

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24. POISONOUS vs NON-POISONOUS SNAKE + TREATMENT (25 Marks)

Differences:

Important Poisonous Snakes in India:

1. Common Cobra (Naja naja) - Neurotoxic
2. Common Krait (Bungarus caeruleus) - Neurotoxic
3. Russell's Viper (Daboia russelii) - Hemotoxic + cytotoxic
4. Saw-scaled Viper (Echis carinatus) - Hemotoxic

Types of Venom:

Clinical Features:

• Local: Mild pain, minimal swelling (krait - very little local effect)
• Systemic:
  • Ptosis (drooping eyelid) - first sign
  • Diplopia (double vision)
  • Dysphagia, dysarthria
  • Respiratory failure (main cause of death)
  • Descending paralysis
  • Coma

• Local: Severe pain, massive swelling, blister formation, necrosis
• Systemic:
  • DIC (disseminated intravascular coagulation)
  • Hemolysis
  • Bleeding from all sites (gums, nose, injection sites)
  • Hematuria, hematemesis
  • Renal failure
  • Hypotension, shock
  • 20-minute whole blood clotting test (WBCT) - non-clotting indicates viper envenomation

Diagnosis:

• Clinical + history
• WBCT (20-minute test): Blood in glass tube - if not clotted after 20 min = viper bite
• CBC, coagulation profile, renal function

TREATMENT:

• DO: Immobilize limb, keep calm, transport to hospital quickly
• DON'T: Tourniquet, incision and suction, electric shock, traditional remedies

1. Airway, Breathing, Circulation
2. IV access, IV fluids
3. Oxygen
4. Monitoring

• Polyvalent ASV - effective against all Big Four (used in India)
• Indications for ASV (any one):
  • Neurotoxic signs (ptosis, paralysis)
  • Hemotoxic signs (positive WBCT, bleeding)
  • Cardiovascular shock
  • Local tissue necrosis progressing
  • Hemoglobinuria/Hematuria

• Mild: 8-10 vials IV
• Moderate: 10-15 vials
• Severe: 15-20+ vials
• Give IV slowly (skin test not recommended as can cause false reactions)
• Watch for anaphylaxis (adrenaline ready)

• Neostigmine (anticholinesterase) + Atropine (for muscarinic side effects)
• Especially if cobra bite
• Mechanical ventilation if respiratory failure

• Fresh Frozen Plasma (FFP), clotting factors
• Platelets if thrombocytopenic
• Blood transfusion if hemolysis
• Dialysis if renal failure

Medicolegal Importance:

• Must document fang marks
• Death certificate must state snakebite as cause
• Important in insurance claims
• Distinguish from other causes of sudden death

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25. MEDICAL NEGLIGENCE (25 Marks)

Definition:

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ELEMENTS of Medical Negligence:

1. DUTY of Care:
   • Doctor-patient relationship exists
   • Doctor had a legal duty to provide care
   • Established when: patient comes, doctor accepts, treatment begins
2. DERELICTION (Breach of Duty):
   • Doctor failed to meet the standard of care
   • Did something a reasonable doctor wouldn't do, or
   • Failed to do what a reasonable doctor would do
3. DIRECT CAUSATION (Causa Causans):
   • The breach directly caused the harm
   • "But for" test: but for doctor's negligence, harm wouldn't have occurred
4. DAMAGES:
   • Actual harm/injury/loss to patient
   • Physical, financial, psychological

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TYPES of Negligence:

A. CIVIL NEGLIGENCE:

• Wrong diagnosis leading to unnecessary surgery
• Surgical sponge left inside patient
• Wrong drug given
• Failure to obtain informed consent

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B. CRIMINAL NEGLIGENCE:

• Rash OR negligent act
• Death of patient resulted

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Differences: Civil vs Criminal Negligence:

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DEFENCES Available to Doctors Against Negligence:

• Doctor acted in accordance with accepted medical practice
• A body of responsible practitioners would have done the same
• Even if other doctors disagree

• Honest mistake in clinical judgment
• Not the same as negligence
• Doctor used reasonable care but outcome was wrong
• "Doctors are not guarantors of good results"

• Patient's own conduct contributed to harm
• E.g., patient did not follow post-op instructions, did not disclose drug allergy
• Reduces/eliminates doctor's liability

• Patient voluntarily accepted known risks
• Informed consent signed
• "A person who consents cannot complain of injury"

• If employed by hospital, hospital may bear liability
• Doctor acting within scope of employment
• "Respondeat superior" (let the master be responsible)

• Emergency aid given in good faith
• India: Good Samaritan Law protects those giving emergency help
• Cannot be held liable for unintentional harm in emergency

• Claim filed too late (beyond time limit)

• Even if there was a breach, patient's condition was due to disease, not negligence
• Harm would have occurred regardless

• Complication was a known, accepted risk of the procedure
• Was listed in informed consent
• E.g., damage to recurrent laryngeal nerve during thyroidectomy

• If patient refused treatment against medical advice (DAMA)
• Doctor not liable for consequences of patient's own refusal

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Key Cases in Medical Negligence (India):

• Jacob Mathew vs State of Punjab (2005): SC distinguished civil from criminal negligence - criminal requires gross negligence
• Bolam vs Friern Hospital (1957): Standard of care test
• Bolitho vs City Hackney (1998): Bolam test refined - practice must be logically defensible
• Spring Meadows Hospital vs Harjol Ahluwalia: Consumer courts can hear medical negligence cases

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📋 QUICK REVISION TABLE

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