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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The general answer is that if a prosecuter is able to provide the murder weapon as evidence and link that weapon to the accused, that establishes guilt beyond a reasonable doubt. The whole point of desposing of the weapon is to prevent law enforcement from finding the murder weapon and connecting it to a suspect. In the specific case of firearms, the barrels of guns today are almost universally rifled. That is to say, they have helical grooves on the inside that make the bullet spin and increase accuracy. It is important to note that manyfacturing processes aren’t perfect, and each weapon will have a slightly different groov pattern even between two weapons of the same maje and model. A fired bullet can be recovered and examined under a microscope. The groov pattern on that bullet can be compared to bullets fired under controlled conditions from candidate murder weapons. If forensic scientists can find a match, they can identify the smoking gun as it were. I don’t know if this happens in real life but there is a trope in movies of a murder disassembling a pistol and tossing the parts in different locations to make it harder for the police to recover it
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