Discussion
A man committed suicide by a 0.357 revolver in hard contact of his head. Blood stains were found in the barrel of the revolver due to :
Answer: C
The blood in the barrel is due to the blowback effect.
In a hard-contact gunshot wound of the head, the gases of discharge enter the wound, expand beneath the skin and scalp, and rebound. Blood and tissue are forced back towards the gun and drawn into the muzzle and barrel; this is called blowback, and finding blood inside the barrel is evidence of a contact or near-contact shot.
Back spatter is the wider term for blood travelling back towards the shooter from an entrance wound, and forward spatter leaves through the exit wound. Impact spatter is the general class of stains made when force strikes a blood source.
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