PHILIPPE PSAILA / SCIENCE PHOTO LIBRARY PHILIPPE PSAILA / SCIENCE PHOTO LIBRARY
Fingerprint detection. Forensic scientist looking for fingerprints on a letter. She is wearing orange glasses and viewing the paper under ultraviolet light to reveal the prints. Fingerprints are unique to every individual and by comparing prints found on the letter with those on a database, it can be determined who has handled the letter.
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