Sexual Assault Investigation

Sexual Assault Investigation

Sexual Assault Investigation

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Sexual Assault Investigation - Law & Order

  • Definition (IPC 375): Rape includes penetration of penis into vagina, mouth, urethra, or anus; or object/any body part into vagina, urethra, or anus; or manipulation of body part to cause penetration; or application of mouth. Without consent or with consent obtained under fear, misconception, or from an unsound/intoxicated person, or person < 18 years.
  • POCSO Act, 2012: Protection of Children from Sexual Offences Act. Deals with sexual offences against individuals < 18 years. Stricter punishments, child-friendly procedures.
  • Consent (IPC 90): Not valid if given under fear of injury/death, misconception of fact, by person of unsound mind, intoxicated, or < 18 years.

IPC 376: Punishment for rape. Specific subsections (376A-E, DAB) detail punishments for aggravated forms, repeat offenders, gang rape, etc., including death penalty in certain cases (e.g., causing persistent vegetative state or death).

Sexual Assault Investigation - Victim Care & Clues

  • Victim Care & Consent:
    • Prioritize medical & psychological well-being.
    • Informed consent (CrPC Sec 53A); minor: parental/guardian (POCSO Act).
    • History taking: verbatim, non-judgmental.
  • Examination (As per CrPC Sec 164A):
    • General physical: note injuries, nutritional status.
    • Systemic examination.
    • Genito-anal: inspect for injuries, discharge. Use colposcope/toluidine blue for micro-trauma.
    • ⚠️ Two-finger test (TFT) is BANNED.
  • Evidence Collection Protocol:
    • Clothing: air-dry if wet, pack separately.
    • Swabs: Oral, vaginal (high/low), cervical, anal, perineal, bite marks/stains.
    • Samples: Blood (DNA, STI, alcohol), urine (pregnancy, drugs).
    • Hair (combed & plucked), fingernail scrapings.
    • Documentation: notes, diagrams, photography (with consent). Chain of custody vital.

Sexual Assault Evidence Collection Kit

⭐ Spermatozoa persistence: Vagina up to 72 hrs (motile ~12 hrs), Cervix 5-7 days, Anus/Rectum 24-48 hrs.

Sexual Assault Investigation - Suspect Scrutiny

  • Legal Considerations:
    • Arrest & legal rights (CrPC Sec 53, 53A, 54).
    • Consent for examination is crucial; if refused, proceed under legal provisions.
    • Examination by registered medical practitioner.
  • Physical Examination:
    • Detailed general physical & genital examination.
    • Note signs of struggle: abrasions, bruises, bite marks (swab for DNA).
    • Look for trace evidence: victim's hair, fibers, or DNA on suspect.
  • Sample Collection (within 24-48 hours ideally):
    • Blood: Grouping, DNA, alcohol, drugs.
    • Urine: Drugs.
    • Saliva: Secretor status, DNA.
    • Hair: Scalp & pubic (plucked with roots).
    • Nail clippings/scrapings.
    • Penile swabs: For semen, epithelial cells (if recent coitus alleged).
    • Clothing worn during alleged assault.

CrPC Section 53A mandates the examination of a person accused of rape by a registered medical practitioner, including collection of DNA samples, even without consent if reasonable grounds for belief of offence exist. This was a key amendment post-Nirbhaya case for strengthening evidence collection against the accused.

  • Documentation: Detailed report with all findings, including negative ones (Potency, STIs).

Sexual Assault Investigation - Lab Sleuths & Reports

  • Chain of Custody: Essential documentation trail; ensures evidence integrity and admissibility.
  • Lab Analysis Workflow:
  • Key Lab Investigations:
    • Semen ID:
      • Florence Test (Choline).
      • Barberio's Test (Spermine).
      • Acid Phosphatase (AP): > 50 IU/L = significant.
      • PSA/p30: Confirmatory (even if azoospermic).
    • Spermatozoa (Persistence):
      • Vagina: Motile ~6-12 hrs; Non-motile ~3-5 days.
      • Cervix: Non-motile ~7-10 days. Heads persist longer.
    • DNA Profiling: Links individuals to evidence.
    • STI Screen: HIV, HBV, HCV, Syphilis, Gonorrhea, Chlamydia. Offer PEP.
  • Medico-Legal Report (MLR):
    • Objective findings, expert opinion. Documents chain of custody.

    ⭐ PSA (p30) is a key confirmatory test for semen, vital if sperm are absent (azoospermia/vasectomy).

High‑Yield Points - ⚡ Biggest Takeaways

  • Consent is paramount; its absence defines sexual assault (IPC 375).
  • Conduct medical examination promptly (ideally <72 hours); the Two-Finger Test is banned.
  • Meticulous evidence collection (e.g., swabs, clothing) and strict chain of custody are vital.
  • Semen detection (e.g., Acid Phosphatase test, presence of spermatozoa) is crucial.
  • DNA profiling offers the most conclusive evidence for perpetrator identification.
  • Detailed, objective documentation and empathetic psychological support for the survivor are essential.
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