Collecting evidence. Forensic officer using a pair of tweezers to collect a cigarette butt found at a crime scene. The gloves and protective clothing help to prevent contamination of the evidence. The cigarette butt will be analysed for traces of skin cells and saliva. DNA analysis may then be able to link a suspect to the crime scene. (KEYSTONE/SCIENCE PHOTO LIBRARY/MAURO FERMARIELLO) === ===
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