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In reply to the discussion: NEW WITNESS CONFIRMS TRAYVON MARTIN WAS THE VICTIM [View all]JDPriestly
(57,936 posts)Exit Wounds
Exit wounds - as we have already mentioned - are usually larger than the entrance wound and this is because as the round moves through the body of the victim it slows down and explodes within the tissue and surrounding muscle. This slowing down of the projectile means that as it reaches the end of its trajectory it has to force harder to push through. This equates to the exit wound normally looking larger and considerably more destructive than its pre-cursor - the entrance wound.
Exit wounds will often bleed profusely as they are larger but entrance wounds can sometimes look only like small holes - unless the weapon is fired at close proximity to the victim.
http://www.exploreforensics.co.uk/entrance-and-exit-wounds.html
Seems to me it might be more likely to miss seeing the entrance wound.