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 guns you refer to tend to leave unique marks on the bullet and casing (made by a gun when fired) that could be matched up to a particular firearm. If the gun used in the murder is missing, *then* you could use your “one of thousands” argument.
The knife you described could still have DNA from the victim on it or marks on it made during the stabbing, like a rib or arm bone scratching the metal. Maybe even a whole broken-off tip.
It’s usually better to have the murder weapon missing **to introduce doubt**; its absence can always be explained away as having been lost or stolen.
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