Rifling scratches a bullet and makes it as genuine as a fingerprint. Also when the gunman pulls the trigger tiny bits of explosive, called gunshot residue, sprays out onto the gunners hands. If a suspect is interviewed after a crime, his hands might be swabbed with a special chemical to show if he has fired a gun recently.
What Gun?
Each brand and type of gun has it's own rifling, so forensic scientists might fire a gun of the same type and see if the rifling on the bullet matches. If they match, they will search a suspect for any weapons.
Where?
Where the killer and the victim were standing is also a important clue. Cartridge cases are fired right behind the bullet and will land at the gunners feet, showing were the killer and the victim were standing.
Over & Out!
Elise
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