Revision summary
Forensic science links person, object, and scene for the court. Fingerprints and STR DNA are leading identifiers. Skeletal anthropology estimates the biological profile and trauma. Locard’s exchange guides trace evidence. Error comes from contamination and overclaim; procedure matters.
Model answer
Copper italics in this answer — like this — are the key facts. Each one is unpacked in the Facts & figures rail.
Introduction
Forensic science applies laboratory and field methods to legal questions. In crime work it links person, object, and scene with a chain of custody.
Body
Identity of persons
- Fingerprints after Galton and Indian police practice remain a first-line individualiser.
- DNA STR profiles, as in the UK FSS model and Indian CDFDs, can include or exclude with high power if samples are clean.
- Forensic anthropology estimates age, sex, stature, and ancestry from bone, and trauma from cut marks, as in mass-disaster DVI.
Scene and object
- Ballistics, fibres, glass, and paint use Locard’s exchange: contact leaves a trace.
- Toxicology names poisons. Questioned documents and digital logs widen the file.
- Odontology and bite marks are used with more caution after wrongful-conviction reviews.
Anthropology’s slice
- T. Dale Stewart and later Clyde Snow showed skeletal ID in war-crime and disaster settings.
- Indian cases use forensic medicine departments plus anthropology for unknown remains.
Limits
- Contamination, planted evidence, and oversold ‘unique’ marks have caused error.
- Science helps investigation. Courts still need corroboration and lawful procedure.
Flow diagram
flowchart TD FS[Forensic science] --> ID[Prints DNA bone] FS --> TR[Trace Locard] FS --> LIM[Chain of custody error]
Conclusion
Forensic science helps by identifying people and tracing contact at the scene. DNA, prints, and bones are strong when chain of custody holds; they are not a substitute for the whole case.
Quick related
Students also ask
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Is DNA always enough to convict?
It can strongly include a source. How the DNA arrived, and the rest of the case, still matter.
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Can anthropology name the exact person from a skull?
It narrows the pool. Positive ID still wants DNA, dental records, or unique surgery.
Same topic · past papers
UPSC has asked this before
These previous-year questions sit on the same topic. Open one to practise the earlier ask.
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2025 · Q4(a) · Anthropology GS 1 · 20 marks
Anthropology provides a multidimensional understanding of human beings by bridging the gap between science and humanities. Elucidate
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