PHILIPPE PSAILA / SCIENCE PHOTO LIBRARY PHILIPPE PSAILA / SCIENCE PHOTO LIBRARY
Forensic ballistics research. Policeman firing a pistol retrieved from a crime scene. The bullet will be stopped by the packing material in the metal cylinder. Each gun leaves a slightly different pattern on the casing of a bullet that it fires. Matching casings found at a crime scene with similar ones can identify a weapon, helping to catch the criminal.
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