A process hailed as DNA for guns has helped to clear up many crimes that would otherwise remain unsolved. The NSW Police Force has lifted the lid on its integrated ballistics identification system (IBIS) which has just scored it 350th "cold hit". IBIS is an electronic database of bullets and cartridge cases collected from crime scenes or seized firearms. Using state-of-the-art lasers and microscopes, it scans the unique markings on every surface. A cold hit is... (GunPolicy.org)