Remove dna from arrows

[Razzation]

When I'm using my bow, often a detective will come up and retrieve dna from the arrow. I personally don't feel this is fair, especially if no one saw me shoot the bow. It's essentially the same as being able to get dna from a bullet hole because someone missed. I believe that this should be removed, or only have dna if it hits someone, and only have the dna on it for the duration that it would if it were a bullet and the person died.