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Home/Anthropology/Mains PYQ/2017/Paper I/Applied & Forensic Anthropology
UPSC MainsAnthropology Optional Paper I 2017 20 Marks Model Answer Available

Methods of Personal Identification in Criminal Investigations — 2017 Paper I

Question · 2017 · Paper I · 20 Marks

What are the methods of personal identification? Critically examine how personal identification helps in criminal investigations.

Model Answer

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Approach

  • Demand of Question:Describe principal methods of identifying living and deceased persons and critically evaluate their evidentiary value in criminal investigation.
  • Structuring the Response:Classify morphological, biometric, skeletal, dental, serological and genetic methods; explain investigative uses; then assess reliability, error, chain of custody and ethical limits.
  • Key Dimensions to Cover:Bertillon; Galton; fingerprints; anthropometry; forensic odontology; skeletal identification; blood groups; STR-DNA profiling and Alec Jeffreys; facial/iris biometrics; probabilistic interpretation and chain of custody.

Model Answer

Introduction Personal identification is the process of establishing the exact identity of an individual (living or deceased) based on unique biological, morphological, or behavioral characteristics. In forensic anthropology and criminology, it is the cornerstone of converting biological traces into admissible investigative evidence.

Body

  1. Methods of Personal Identification
  • Morphological and Biometric Methods:
    • Anthropometry: Pioneered by Alphonse Bertillon (Bertillonage, 1879), it used standardized body measurements (e.g., head length, middle finger length) and identifying marks (scars, tattoos). Mostly replaced today, but stature remains a key exclusionary metric.
    • Dermatoglyphics (Fingerprints): Systematized by Francis Galton. The friction ridge patterns (loops, whorls, arches) and minutiae on fingertips are highly individual and remain unchanged throughout life.
    • Modern Biometrics: Iris scans, facial recognition algorithms, and voice profiling.
  • Osteological (Skeletal) Methods:
    • Used when remains are skeletonized, decomposed, or mutilated. Forensic anthropologists estimate the "Biological Profile":
      • Sex: Pelvis (sciatic notch) and skull morphology.
      • Age: Dental eruption, epiphyseal fusion, and pubic symphysis wear.
      • Stature: Measuring long bones (femur, tibia) using regression equations.
      • Ancestry: Cranial indices and nasal bone structure.
  • Forensic Odontology (Dental):
    • Comparing post-mortem dental remains with ante-mortem dental records (fillings, root canals, missing teeth). Enamel survives extreme heat, making this crucial in mass disasters (e.g., plane crashes, fires).
  • Serological and Genetic Methods:
    • Serology: ABO and Rh blood grouping. It is exclusionary (it can prove who is not the suspect, but cannot pinpoint who is).
    • DNA Profiling: Developed by Alec Jeffreys (1985). Modern labs use Short Tandem Repeats (STRs) from nuclear DNA for near-absolute individualization. Mitochondrial DNA (mtDNA) is used for degraded bones or hair shafts, tracing maternal lineage. Y-STRs isolate male DNA in mixed samples (e.g., sexual assaults).
  1. Role in Criminal Investigations
  • Linking Suspect to Scene: Locard's Exchange Principle states "every contact leaves a trace." Latent fingerprints or DNA left at a crime scene places the suspect at the location.
  • Victim Identification: Naming unknown deceased persons (John/Jane Does) allows police to investigate their social circle, often leading to the perpetrator.
  • Exoneration: Just as importantly, accurate identification excludes innocent individuals. DNA evidence has freed thousands of wrongfully convicted people globally.
  • Tracking Serial Offenders: DNA databases (like CODIS) connect unsolved "cold cases" to repeat offenders.
  1. Critical Examination and Limitations
  • Probabilistic, Not Absolute: With the exception of STR-DNA and pristine fingerprints, forensic identification is probabilistic. Skeletal age and stature provide ranges, not exact numbers.
  • Cognitive Bias & Error: Fingerprint matching relies on human examiners and can be subjective. Poor-quality or partial prints can lead to false positives.
  • Contamination and Chain of Custody: DNA is highly sensitive. Secondary transfer (e.g., Suspect A touches an object, Person B touches it and leaves it at a crime scene) or lab contamination can falsely implicate individuals. Rigid chain-of-custody protocols are mandatory.
  • Ethical Concerns: Facial recognition algorithms suffer from demographic biases (higher error rates for minorities). Mass DNA databases raise deep privacy and consent issues.

Conclusion Personal identification is indispensable in modern criminal justice. However, relying blindly on forensic science is dangerous; its evidentiary value is only as strong as the scientific validation of the method used, the integrity of the chain of custody, and the probabilistic transparency of the expert witness.

2026 Health as a cultural construct. 2026 What is meant by a somatotype? Discuss the Heath-Carter anthropometric method, giving its advantages over that of Sheldon's method. How can somatotyping be applied in sports sciences? 2026 Anthropometry in ergonomics. 2025 Examine the utility of human remains in forensic analysis. Discuss the facial reconstruction technique.

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