PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Forensic evidence for DNA (deoxyribonucleic acid) analysis. Policeman handing a blood-stained knife in an evidence bag to a forensic scientist. The blood and other biological material on this knife can be analysed for traces of genetic material, and compared to the DNA of suspects, or compared to DNA profiles held in databases. The machines in the background are spectrographs, used to detect trace materials. Photographed at the Scientific Police Laboratory of Marseilles, France.
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