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FORENSIC MEDICINE ANSWERS

Source: KS Narayan Reddy's Essentials of Forensic Medicine and Toxicology, 36th Ed. (VV Pillay)

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QUESTION 1 - Long Essay (10 marks)

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(a) Minimum Time Elapsed After Death (1 mark)

• Rigor mortis begins 1-2 hours after death in face and jaw
• It spreads downward - neck (3-4 hrs), trunk (6-8 hrs), limbs (12 hrs)
• Complete rigidity of the body (from face to lower limbs) is established in approximately 12 hours
• Rigor mortis is complete and maximum from 12-24 hours after death

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(b) Who Should Conduct the Inquest? (1 mark)

1. Dowry death - The father has complained of harassment for money (dowry), making this a potential dowry death
2. Death of a married woman within 7 years of marriage under suspicious circumstances
3. Cases where the Executive Magistrate (District Magistrate, Sub-Divisional Magistrate, or Tahsildar specially empowered) must hold the inquest

• This is a dowry death case - the woman is 18 years, recently married, with a complaint of dowry harassment
• The ligature mark is horizontal and completely encircling the neck below the thyroid cartilage - a classic feature of strangulation, not hanging
• Section 304B IPC (Dowry Death) is applicable
• Section 498A IPC (Cruelty by husband/relatives) is applicable

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(c) Medicolegal Duties of the Casualty Medical Officer (2 marks)

1. Examination and Documentation:
   • Examine the body carefully and document all findings in the medicolegal register
   • Note the ligature mark - its position (level of thyroid cartilage vs. below), direction (horizontal/oblique), width, depth, nature (single/multiple), circumferential or not
   • Note rigor mortis - its extent and distribution (helps estimate time of death)
   • Note postmortem lividity (hypostasis) - its position, fixity, and distribution
   • Document any other signs of violence, petechiae, cyanosis, ecchymoses
2. Inform the Police:
   • The CMO must immediately inform the police officer-in-charge of the jurisdiction (S. 174/175 BNSS)
   • Do NOT hand over the body to relatives without police permission
   • Do NOT issue a death certificate without police clearance in unnatural/suspicious deaths
3. Preserve Evidence:
   • Preserve the ligature (if any) for forensic examination
   • Do not remove clothes; preserve them in paper bags labeled appropriately
   • Preserve any trace evidence (soil, fibers, hair) on the body
4. Intimate the Magistrate:
   • As this is a suspected dowry death, must inform the Executive Magistrate
   • Must inform the hospital superintendent/authority as per protocol
5. Register as Medicolegal Case (MLC):
   • Assign a unique MLC number; document time of arrival, who brought the body, circumstances as stated by relatives
   • Note the conspicuous discrepancy: complete rigor mortis is incompatible with the history of being alive 30 minutes ago
6. Send for Postmortem:
   • After police/magistrate inquest, send the body along with inquest report (panchanama), dead body challan, and clothing to the nearest authorized government mortuary for postmortem examination
7. Maintain Confidentiality and not discuss case details with anyone except authorized persons.

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(d) Special Autopsy Procedure to Be Adopted (3 marks)

• Examine and photograph the ligature mark in detail:
  • Position on the neck - at or above/below the level of thyroid cartilage
  • Direction - horizontal mark (typical of strangulation); oblique/V-shaped mark is typical of hanging
  • Width of mark (here 1 cm wide pressure abrasion)
  • Whether completely encircling (both features suggest strangulation)
  • Imprint characteristics matching ligature material
• Examine face and head for petechiae in conjunctiva, sclera
• Examine tongue - protruded or not; bitten
• Note cyanosis of lips, fingertips

• Reflect skin from the neck first before reflecting the scalp - to prevent artificial hemorrhages from scalp incisions tracking down
• Layered dissection of neck: skin and subcutaneous tissue, superficial fascia, deep fascia, strap muscles - separately at each layer
• Examine in situ - do NOT remove neck structures en masse; examine while still connected to avoid postmortem artefacts (dissection artefacts)
• Look for bruising/hemorrhage in: skin, subcutaneous tissue, strap muscles, thyroid gland
• Examine the hyoid bone - fracture of the greater cornua (more common in throttling/strangulation; rare in hanging unless judicial)
• Examine the thyroid cartilage for fractures
• Examine the cricoid cartilage
• Examine cervical vertebrae (C2-C3, C3-C4) for fractures/dislocations

• Separate incision through posterior neck to examine ligaments, cervical vertebrae, and expose spinal cord - to rule out fracture-dislocation

• Open skull to check for cerebral congestion, subarachnoid hemorrhage, petechiae on brain surface

• Preserve blood, vitreous humor, urine, bile, stomach contents for toxicological analysis (rule out ante-mortem poisoning/sedation)
• Preserve gastric contents in 100 mL bottle with 1% formalin
• Liver, kidney, half of the brain (without formalin) for chemical examination

• Photograph the ligature mark, petechiae, and other findings at each step

• Swabs from fingernails (for DNA/trace material from assailant)
• Vaginal swabs for rape/assault

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(e) Probable Cause of Death and Other PM Findings (3 marks)

• Face and head: Congestion, cyanosis, puffiness of face
• Petechiae (Tardieu spots): Tiny pinpoint hemorrhages on conjunctivae (highly characteristic), sclera, skin of face, forehead - due to venous obstruction with capillary rupture
• Tongue: Slightly protruded, bitten, cyanosed
• Eyes: Prominent, bloodshot
• Frothy/blood-tinged fluid from mouth and nostrils

• The ligature mark: Horizontal, depressed, reddish-brown or pale, parchment-like pressure abrasion, completely encircling, 1 cm wide, well below thyroid cartilage
• Bruising at edges of the mark (if hard ligature)

• Bruising in strap muscles of neck
• Hemorrhage into subcutaneous tissue
• Fracture of hyoid bone greater cornua (common in strangulation)
• Fracture of thyroid cartilage (if considerable force used)
• Hemorrhage into thyroid gland
• NO fracture of cervical vertebrae (unlike judicial hanging)

• Lungs: Deeply congested, edematous; Tardieu spots (subpleural petechiae) on pleural surface
• Heart: Right side dilated and engorged with blood; left side empty
• Liver: Congested
• Petechiae under visceral pleura and pericardium

• Cerebral congestion
• Petechiae in brain substance

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QUESTION 2 - Long Essay (10 marks)

Classification of Poisons by Mode of Action (3 marks)

• Strong acids: H₂SO₄, HCl, HNO₃, Carbolic acid
• Strong alkalis: NaOH, KOH, NH₄OH
• Salts of heavy metals: ZnCl₂, HgCl₂
• Local action only; coagulative or liquefactive necrosis

• Metallic: Arsenic, Mercury, Lead, Antimony, Copper, Phosphorus
• Non-metallic: Chlorine, Bromine, Iodine

• Vegetable: Castor oil (Ricin), Croton oil, Colchicum, Cantharides
• Animal: Snake venom, Cantharides (Spanish fly)

• Spinal depressants: Chloroform, Ether, Alcohol
• Cerebral excitants: Cocaine, Camphor
• Narcotics: Opium and derivatives (Morphine, Heroin)
• Deliriants: Cannabis, Atropine (Datura), Hyoscine

• Excitants: Strychnine, Tetanus toxin
• Depressants: Curare (D-tubocurarine)

• Curare, Conium (Hemlock)

• Digitalis, Aconite, Veratrum, Hydrocyanic acid (Prussic acid)

• CO, CO₂, HCN - interfere with oxygen transport/utilization

• Putrefactive poisons, ptomaines
• Microbial food poisons (Botulinum toxin, Salmonella)

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Medical Management of a Case of Poisoning (4 marks)

• A - Airway: Open and clear the airway of secretions/vomit; secure by endotracheal intubation if needed
• B - Breathing: Maintain adequate ventilation; graduated O₂ therapy via ventimask or ETT if arterial blood gas cannot be maintained
• C - Circulation: IV fluid administration; maintain BP; treat arrhythmias
• D - Depression of CNS: Correct coma; place unconscious patient in recovery position (lateral decubitus) to prevent airway obstruction and allow fluid drainage

• Use Ewald's tube or ordinary soft rubber tube (1 cm diameter, 1.5 m length)
• Patient positioned in left lateral or semi-prone position
• Lavage with warm water (initially), then antidote solution
• 300-500 mL aliquots at a time; total 10-20 litres
• Leave activated charcoal suspension (4 g/kg body weight) in stomach
• Contraindicated in: corrosive poisoning (absolute), convulsant poisons, comatose patients (use cuffed ETT), volatile poisons, esophageal varices

• Common salt - precipitates silver nitrate (as silver chloride)
• Albumin - precipitates mercuric chloride
• Potassium permanganate (1:5000) - for opium, strychnine, phosphorus, cyanides
• Atropine - for organophosphate poisoning
• Naloxone - for opioid poisoning
• Flumazenil - for benzodiazepine poisoning

• Pralidoxime (2-PAM) - for organophosphate (reactivates cholinesterase)
• Dimercaprol (BAL) - for heavy metal poisoning (As, Hg, Pb)
• EDTA - for lead poisoning
• N-Acetylcysteine - for paracetamol overdose
• Methylene blue - for methemoglobinemia (nitrite poisoning)
• Desferrioxamine - for iron poisoning

• Forced diuresis (alkaline or acid) - e.g., sodium bicarbonate infusion for salicylate poisoning
• Hemodialysis - for salicylates, barbiturates, methanol, ethylene glycol, lithium
• Hemoperfusion - for barbiturates, theophylline, paraquat, carbamazepine
• Multidose activated charcoal: repeat doses 0.5-1 g/kg every 4-6 hrs; reduces half-life of several drugs

• Treat convulsions (diazepam IV)
• Treat arrhythmias (antiarrhythmics)
• Treat pulmonary edema (furosemide, IPPV)
• Maintain body temperature
• Treat metabolic acidosis

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Medicolegal Duties of a Doctor in a Case of Poisoning (3 marks)

1. Treat first, investigate later - Immediate priority is saving the patient's life; medicolegal aspects must not delay treatment
2. Register as MLC (Medicolegal Case):
   • Assign MLC number; document time of arrival, name of patient, address, who brought the patient, history given
3. Record detailed history and clinical findings:
   • Nature of poison (if known), route (ingested/inhaled/injected/absorbed)
   • Time of poisoning, quantity consumed
   • Symptoms present, vital signs, CNS/GI/CVS findings
   • All findings to be written legibly with date and time
4. Preserve samples for chemical analysis:
   • Vomitus (in clean wide-mouth bottle), gastric lavage washings
   • Blood (10 mL), urine (100 mL)
   • Feces, cerebrospinal fluid if required
   • Label all samples; send to Forensic Science Laboratory under proper chain of custody
   • DO NOT accept samples not collected personally or not properly labeled
5. Inform the Police:
   • Compulsory in all cases of suspected poisoning (S. 39 BNSS - formerly S. 39 CrPC)
   • Inform police even if the patient denies being poisoned
   • In case of accidental, suicidal, or homicidal poisoning - all must be informed
6. Preserve the poison/container:
   • Any poison container, leftover tablets/powder brought with the patient must be seized and labeled as evidence
   • Hand over to police under proper receipt
7. Maintain confidentiality:
   • Information given only to authorized police/magistrate/court, not to media or public
8. Prepare and submit Medicolegal Report (MLR):
   • Detailed report for police/court including clinical findings, samples collected, treatment given
9. Dying Declaration:
   • If patient is conscious and in danger of dying, the CMO must record the dying declaration in the presence of a magistrate if available; if Magistrate is not available, the CMO himself can record it as a professional of credibility
10. In case of death:
    • Do NOT issue a death certificate; inform police for inquest and postmortem
    • Preserve the body; do not hand over to relatives without police permission

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QUESTION 3 - Short Essay (6 marks)

Four Constituents (Elements) of Medical Negligence (2 marks)

1. DUTY - Existence of a duty of care by the doctor toward the patient
   • A professional relationship must exist; the doctor must have accepted the patient for treatment
   • A doctor is not obligated to treat every patient (except in emergencies)
2. DERELICTION (Breach of Duty) - The physician must have failed to conform to the standard of care applicable to him
   • Either by improper deviation from accepted practices (methods, procedures, treatments), or by employing accepted practices but doing so unskillfully
   • The standard used is that of an ordinary doctor of the same specialty
3. DIRECT CAUSATION (Damage must be directly caused by Dereliction) - There must be a direct causal link between the breach of duty and the injury/damage
   • The injury must be a direct and proximate result of the negligence, not a remote consequence
4. DAMAGES - The patient must have suffered actual harm/injury as a result
   • Physical injury, mental anguish, financial loss
   • Without actual damage, a suit for negligence cannot succeed

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Four Pleas (Defenses) a Doctor Can Put Forth Against a Suit of Criminal Negligence (4 marks)

1. No Duty Owed to the Plaintiff:
   • The doctor had no professional duty toward this particular patient; no doctor-patient relationship was established
   • E.g., a consultant who gave informal advice without formally accepting the patient
2. Duty Discharged According to Prevailing Standards:
   • The doctor followed the accepted standard of care (Bolam's principle - "the standard of the ordinary skilled man exercising and professing to have that special skill")
   • Expert testimony can prove that what the doctor did conforms to accepted practice
   • A doctor is not guilty of negligence if he has acted in accordance with the practice accepted by a responsible body of medical men skilled in that particular art
3. Misadventure (Therapeutic Misadventure):
   • The injury/death was the result of an unforeseeable accident, not negligence
   • A misadventure is an unintentional act - e.g., anaphylaxis to penicillin despite negative sensitivity test, unexpected surgical complication
   • The law does not hold a doctor responsible for a result that could not have been foreseen and guarded against
4. Error of Judgment:
   • An error of judgment is NOT the same as negligence
   • Even a careful and skilled doctor may make an honest mistake in clinical judgment
   • If a doctor exercises reasonable skill and care but the result is unfavorable, it is an error of judgment, not negligence
   • Criminal negligence requires something more than a mere error of judgment
5. Contributory Negligence:
   • The patient himself contributed to the injury by his own negligence
   • E.g., failure to follow medical advice, taking unprescribed drugs, non-compliance with treatment
   • Partial defense; may reduce compensation
6. Res Judicata (Section 337 BNSS):
   • If the same question of negligence has already been decided by a court between the same parties, the patient cannot contest the same question again
   • Only an appeal can be made
7. Limitation:
   • A suit for damages must be filed within 2 years from the date of alleged negligence (3 years if breach of contract)
   • A suit filed beyond limitation will be dismissed

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QUESTION 4 - Short Essay (6 marks)

Steps of Recording Evidence from a Witness in a Court of Law (4 marks)

1. Name, qualifications, designation, place of work
2. Experience in the relevant field
3. Facts of the case (examination findings, opinion given)
4. Opinion and conclusions

1. Challenge the witness's credentials, memory, or observation
2. Discredit findings or opinion
3. Introduce alternative explanations
4. Test the consistency and reliability of statements

1. Clarify matters raised during cross-examination
2. Explain any apparently contradictory answers given during cross-examination
3. Limited to matters arising in cross-examination

• Always tell the truth; an expert witness has a duty to the court, not the party calling him
• Speak clearly and in language understandable to the court
• Confine opinions to one's area of expertise
• Acknowledge uncertainty when present; do not overstate conclusions
• Do not argue with counsel; answer questions put and nothing more
• Bring all relevant documents (case notes, PM report, MLC register entry)

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Procedure and Applications of DNA Fingerprinting (2 marks)

1. Sample Collection: Blood, semen, hair roots, saliva, skin, bone, teeth - any nucleated cell source
2. DNA Extraction: Cell lysis; protein removal; DNA precipitation
3. Restriction Enzyme Digestion: DNA cut at specific sequences using Restriction Endonucleases (e.g., HindIII) → produces Restriction Fragment Length Polymorphisms (RFLPs)
4. Gel Electrophoresis: DNA fragments separated by size on agarose gel
5. Southern Blotting: DNA transferred from gel to nitrocellulose or nylon membrane
6. Hybridization: Radioactively labeled probes bind to complementary sequences (minisatellite/VNTR - Variable Number Tandem Repeat regions)
7. Autoradiography: X-ray film exposed to produce a pattern of bands - the "DNA fingerprint"
8. Comparison: The banding pattern from the crime scene sample is compared with known samples from suspects/victims

1. Identification of criminals - from biological material (blood, semen, hair) at crime scene
2. Rape cases - matching seminal stains with accused
3. Paternity/maternity disputes - establishing biological parentage
4. Identification of deceased - mass disasters, decomposed/skeletonized remains (using dental pulp, bone)
5. Immigration disputes - proving family relationships
6. Exchanged babies - establishing biological identity of newborns
7. Identifying missing persons
8. Exonerating the innocent - acquitting falsely accused persons

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QUESTION 5 - Short Essay (6 marks)

Pathophysiology of Seawater Drowning (2 marks)

1. When sea water is aspirated into the alveoli, the hypertonic salt water draws fluid from the blood (osmosis) into the alveolar spaces and lung tissues
2. This produces severe pulmonary edema - the lungs fill with protein-rich fluid drawn from the bloodstream
3. The lungs become heavy, waterlogged, and "stiff" (decreased compliance)
4. Simultaneously, salts from sea water pass into the bloodstream to re-establish osmotic balance
5. Hemoconcentration occurs (opposite to freshwater drowning where hemodilution occurs)
6. Hypernatremia and raised plasma sodium lead to marked bradycardia
7. Serum electrolytes: Na⁺ and Ca²⁺ decrease initially in blood relative to lungs; proteins and hemoglobin are also reduced proportionately in the blood
8. Heart failure may occur from myocardial anoxia and increased blood viscosity
9. Red blood cells are crenated (not lysed, as in freshwater drowning)
10. Slow death from asphyxia is the typical mode - slower than freshwater drowning
11. Surfactant function is disrupted → alveolar collapse → ventilation-perfusion mismatch → ARDS in survivors

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Autopsy Findings in Drowning (3 marks)

1. Froth/foam - Fine, white, persistent, mushroom-shaped froth at nostrils and mouth (formed by mixture of mucus, air, and water during respiratory efforts)
2. Washerwoman's hands/feet - Sodden, thickened, wrinkled, white skin on palms and soles due to water absorption; starts at fingertips within 2-4 hours, spreads to palm in 24 hours
3. Goose skin (Cutis anserina) - Contraction of arrector pili muscles due to cold water stimulation; also seen postmortem
4. Mud/weeds/debris - Gripped tightly in hands (cadaveric spasm - occurs at moment of death)
5. Bloating/discoloration - Face livid/black changing to deep green; bloated in later stages
6. Abrasions - On hands, knees, face from contact with riverbed/rocks during struggle

1. Lungs: Voluminous, ballooned, waterlogged; pitting on pressure; cover the pericardium (over-inflated); pale grayish-pink; fine frothy fluid on cut surface - emphysema aquosum (most important finding)
2. Water in airways: Frothy fluid in trachea, bronchi
3. Subpleural petechiae (Tardieu spots): On visceral pleura and subpleural surfaces
4. Stomach contents: Water, diatoms, algae, mud, sand (foreign material)
5. Cerebral changes: Cerebral edema
6. Heart: Right side engorged; left side relatively empty
7. Sand/diatoms in lungs: Foreign material mixed with frothy fluid

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Laboratory Investigation (1 mark)

• Diatoms are microscopic unicellular algae with silica cell walls that resist putrefaction
• In true drowning (ante-mortem), diatoms enter the circulation through the ruptured alveolar capillaries and are found in bone marrow, liver, kidneys, brain
• The specimen (femur marrow, liver biopsy) is digested with concentrated acid (H₂SO₄ or HNO₃) which destroys organic matter; the silica shells of diatoms remain
• Centrifugation and microscopy reveal intact diatom shells
• Positive finding (diatoms in internal organs matching species in drowning water) = ante-mortem drowning
• If body was immersed after death, diatoms are found only in the lungs/airways, NOT in internal organs (since circulation has ceased)

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QUESTION 6 - Short Essay (6 marks)

Findings in Habitual Passive Agent and Active Agent of Sodomy (6 marks)

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• Funnel-shaped deformity of the anus - the anus appears as an inverted cone/funnel shape when the buttocks are separated (most characteristic finding)
• Patulous (gaping) anus - the anus is loose, wide, and does not contract normally; the sphincter is lax and atonic
• Flattening of anal folds (corrugations) - normally the anus has prominent radiating folds; in habitual passive agents these folds are smooth and flattened
• Thickening and pigmentation of the perianal skin - the skin around the anus becomes thick, smooth, and hyperpigmented (leathery appearance)
• Absent or diminished anal reflex - tickling the perianal skin normally produces anal contraction; this reflex may be diminished or absent
• On rectal examination: lax sphincter ani - both internal and external sphincters are relaxed and offer little resistance

• Rectum is lax and capacious
• Mucous membrane of rectum may show: chronic inflammation, scarring, thickening
• Absence of acute tears (in chronic cases, old scars/linear white marks replace acute tears)
• Venous congestion of rectal mucosa

• Hemorrhoids (piles) may develop due to repeated distension and venous congestion

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• May show fecal staining - feces on the glans/shaft
• Fissures or abrasions on the glans or prepuce from friction with anal musculature
• In acute recent cases: signs of frottage - superficial abrasions/excoriations on the prepuce

• Fecal matter, rectal contents, or lubricants may be found in pubic hair

• The active agent may acquire gonorrhea (rectal gonorrhea from passive partner), syphilis, herpes, or HIV
• Perianal/penile ulcers, discharges may indicate STIs

• No specific structural changes in the anus of the active agent (unlike the passive agent)
• Psychological examination may be supportive

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Differentiation of Recent vs. Habitual Passive Agent:

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QUESTION 7 - Medical Termination of Pregnancy (MTP) Act

Medical Termination of Pregnancy Act, 1971 (Amended 2002, 2021)

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• Pregnancy can be terminated if continuation involves a "risk to the life of pregnant woman" or causes "grave injury to her physical or mental health"
• No upper gestational limit for this indication

• If there is substantial risk that the child would be born with serious physical or mental abnormality
• No gestational limit - can be terminated at any stage
• Examples: rubella, chickenpox, smallpox, toxoplasmosis in first trimester; exposure to steroids, antidepressants, antimitotic drugs (thalidomide), X-rays, or radiotherapy

• Pregnancy due to failure of any contraceptive device or method used by the woman or her partner (not just husband - important amendment)
• The anguish is presumed to constitute grave injury to mental health
• Applicable only up to 20 weeks of pregnancy

• Pregnancy alleged to have been caused by rape
• The anguish shall be presumed to constitute grave injury to mental health
• Applicable up to 20 weeks; beyond 20 weeks, requires Medical Board approval

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• Up to 20 weeks: One registered medical practitioner's opinion required
• 20-24 weeks: Opinion of two registered medical practitioners required; applicable to special categories:
  • Survivors of rape or sexual assault (including minors)
  • Change of marital status during pregnancy (widowhood/divorce)
  • Women with physical disabilities (as per MTP Rules)
  • Mentally ill women
  • Fetal malformations incompatible with life/likely disability
  • Women in humanitarian settings/disaster/emergency
• Beyond 24 weeks: Only for substantial fetal abnormalities (diagnosed by Medical Board); no upper limit; Medical Board at State/UT level must approve

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• PG degree or diploma in Obstetrics and Gynecology, OR
• Has assisted in performing at least 25 MTPs, OR
• Has at least 6 months' experience as house surgeon in Obstetrics and Gynecology in a recognized hospital

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1. Government hospitals approved by Government
2. Private/nongovernmental institutions licensed by Government (or district-level committee with Chief Medical Officer as chairperson)

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• Adult woman: Written consent of the woman herself is required
• Minor or mentally ill: Written consent of the guardian
• Confidentiality (2021 amendment): The name and details of the woman shall NOT be disclosed; punishment for violation of confidentiality

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1. Upper limit extended from 20 to 24 weeks for specified categories of women
2. Partner's contraceptive failure now included (previously only wife's failure was covered)
3. "Husband" changed to "partner" (covers unmarried women)
4. Medical Board for late-stage terminations (beyond 24 weeks)
5. Confidentiality clause strengthened - identity of woman seeking MTP cannot be disclosed except to authorized persons; violation is punishable

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