If a murder victim's blood is found in the muzzle of a firearm:

Name: If a murder victim's blood is found in the muzzle of a firearm:
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Finding a murder victim's blood in the muzzle of a firearm indicates that the firearm was present during the injury to the victim, as blood spatter or blowback could deposit blood into the muzzle when a gun is fired at close range. This does not necessarily identify the shooter or confirm the firearm as the murder weapon without further evidence.

If a Murder Victim's Blood Is Found in the Muzzle