For example if you use a gun to kill someone how could the bullet possibly be linked to you thousands of guns use the same caliber or a knife even though you would feel terrible looking at the knife wouldn’t it make more sense to just clean it and continue to keep the knife in your home so it make sense that your dna is on it? in movies people always feel the need to get rid of the weapons but i think it would make more sense to keep it unless there’s something i’m missing
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So bullets are actually slightly larger than the barrels they are fired through so when the bullet is being passed through it actually crushes a little and every barrel is slightly different so a bullet can be traced to a specific barrel
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