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

Question

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

In: 0

Answer 1

Because it is just one more piece of evidence that could be used against you, given high-tech forensics are now possible in many jurisdictions. Better to remove that one extra piece of potential evidence.

Edit: don’t do crimes, kids.