MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Fingerprinting suspect. Inked finger of a suspect who is being fingerprinted. The ink is applied to below the first knuckle and around to the edges of the nail because the finger is rolled over the paper to record a print of the whole surface. The same is done for all the other digits on both hands. Further prints are sometimes needed of the whole hand or to show more detail. The ridges form a distinctive pattern that is unique for each person. The fingerprints can be compared to those found at crime scenes, enabling the police to link suspects to a crime.
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