Question
Principle shown in the photograph is used for ?
A. Detecting poisoning.
B. Age estimation.
C. Finding out time since death.
D. Detecting crime.
Show Answer
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Correct Answer » D Explanation |
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Ans:D. Detecting Crime
Locard’s exchange principle
- In Forensic science, this principle(sometimes simply Locard’s principle) holds that the perpetrator of a crime will bring something into the crime scene and leave with something from it, and that both can be used as forensic evidence.
- Wherever he steps, whatever he touches, whatever he leaves, even unconsciously, will serve as a silent witness against him.
- Not only his fingerprints or his footprints, but his hair, the fibers from his clothes, the glass he breaks, the tool mark he leaves, the paint he scratches, the blood or semen he deposits or collects.
- All of these and more, bear mute witness against him.
- This is evidence that does not forget.
- It is not absent because human witnesses are.
- It is factual evidence.
- Physical evidence cannot be wrong, it cannot perjure itself, it cannot be wholly absent.
- Only human failure to find it, study and understand it, can diminish its value.