Criminals are not noted for cleaning up after themselves when they skedaddle from a crime scene.They take their guns but leave behind spent cartridge casings and bullets.
New technology helps solve gun crimes faster than ever before
Spent bullet hi-res stock photography and images - Alamy
Empty brass casings hi-res stock photography and images - Alamy
Firearm Forensics on Trial Hopkins Bloomberg Public Health Magazine
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Tank Model Fake Bullet Casings Model Forces The Army as a Souvenir Medium Tank Crafts
KBI goes high-tech to identify spent bullet casings News, Sports, Jobs - Lawrence Journal-World: news, information, headlines and events in Lawrence, Kansas
This Machine Could Prevent Gun Violence — If Only Cops Used It
7×57mm Mauser - Wikipedia
How To Regulate Tech: A Technology Policy Framework for Online Services - Center for American Progress
National Integrated Ballistic Information Network (NIBIN)
Ballistic Fingerprint' Database Expands Amid Questions About Its Precision : NPR