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Collecting evidence. Forensic scientist using an adhesive roller to collect hair and clothing fibres from a blood-stained dress. Further analysis may link the evidence to a suspect, placing them at the crime scene. The protective clothing and gloves are intended to prevent contamination of the evidence. Amicroscope (upper right) is used for a detailed examination of the dress before the use of this roller. (KEYSTONE/SCIENCE PHOTO LIBRARY/MAURO FERMARIELLO) === ===