MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Forensic DNA analysis. Forensic scientist holding a vial containing DNA amplified from a trace amount found at a crime scene. The DNA is the cloudy strand at the base of the vial. DNA (deoxyribonucleic acid) is found in cells, and can be used as a genetic fingerprint to uniquely identify an individual. Modern procedures allow fast processing of samples and the results can be entered into databases with DNA details of many thousands of criminals and other individuals. DNA evidence is considered conclusive proof that a suspect was at a crime scene. DNA analysis can help solve old crimes and identify human remains. Tissues used include blood, saliva, skin and hair.
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