Fingerprint analysis. Partial fingerprint retrieved from a crime scene (left) being compared to a full fingerprint from a database. The red dots show the positions of distinguishing features on both, showing that the partial print is from the same finger as the print on file. Fingerprints are unique to every individual. Having a computer database of fingerprints allows prints recovered from a crime scene to be matched against those already on file, which can place a suspect at a crime scene.
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