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Forensic analysis of a shooting. Policeman with a set-up of the shooting of a driver. The impact points on the car's window and the driver's seat have been tagged (A and B respectively), and used to calculate the angle from which the shot was fired. The reconstructed path of the bullet is represented by a yellow rod linking the tags with the gun. Such analysis is essential in ascertaining the location and thus identity of the shooter. (KEYSTONE/SCIENCE PHOTO LIBRARY/PHILIPPE PSAILA)