eli5 why would you want to get rid of the weapon used in a crime?

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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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Anonymous 0 Comments

Dpeends. It’s not about keeping from being found at all. It’s about preventing someone from proving that you were the one if they find you otherwise.

For example say a security camera sees you and a couple other guys near the murder site at the appropriate time. That’s enough suspicion to get a warrant to search your place, but not enough to prove you did it, but if they happen to find a knife you kept with traces of blood in the wood grain of the handle, or a gun whose rifling pattern matches the bullets (which is a forensics technique that can strongly link a specific bullet to a specific gun) then you are in trouble.

You can clean the knife sure, but maybe you didn’t clean it well enough. And maybe you can scrape the barrel of the gun to fouled up forensics, but then the fact that you scraped out the barrel is unusual and counts as evidence itself.

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