cassandrasdaddy:
My sarcasm detector is broken. If you were being sacrastic, then ignore the rest of this post.
I understand what you're saying, but I still don't agree.
Let's say that what I said wasn't true in practice. What good does voluntarily bringing your gun in for a test do?
You didn't do it, so nothing. You're wasting the lab's time, and officers time. Time that could be better spent investigating, coming up with real evidence to try and find somebody. Remember, that forensics lab has tons of other cases to work, not just this one. You're wasting their time trying to find other killers, and rapists, etc.
Now let's assume that the fickle finger of fate falls on you.
Let's also assume you are innocent. Let's say your .40S&W Glock was one digit off in serial number from the killers. The barrel was forged nearly exactly the same as the killers, in the same batch of pressings. (How do they make firearm barrels anyway? I have no idea, but just bear with me)
So they test your gun, and some overworked scientist in the lab feels that your gun is remarkably similar to the one that killed that little girl.
Guess what? You've now got the cops all over you. Remember, you're innocent. If you just kept your mouth shut, and kept your gun to yourself, the police wouldn't have any reason to wrongfully suspect you.
This happens, and it's documented plenty of times. THIS is why lawyers tell you not to talk to the police. Check out those video links I posted earlier. They are eye-opening.