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Spent shell casings collected from the ground after a police shooting

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Is there a Ballistic database for shell casings recovered at crime scenes? Like we have for fingerprints to scan for suspects. Do we have that technology if someone wanted to check a

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What we know about 4 recent shootdowns of unidentified objects : NPR

What we know about 4 recent shootdowns of unidentified objects : NPR

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NIBN, the tool tracing guns used in US crimes, has a blindspot