GARY SMITH / SCIENCE PHOTO LIBRARY GARY SMITH / SCIENCE PHOTO LIBRARY
Police evidence bag with bullet cases (centre) and dial calipers (right). The bullet case is part of the cartridge that contains the gunpowder charge, the primer and the bullet. Police collect the empty cases as evidence when a firearm has been used at a crime scene. The dial calipers are used to accurately measure the length of the cases.
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