Re:But why? (Score 0)

All ballistics does is connect a bullet with a specific gun via the rifling cuts the weapon placed on the bullet. An unregistered weapon can be cleaned then dumped and after that point there's nothing connecting the shooter to the weapon. The police can even find a dumped weapon but that's where the case goes dead; when a firearm is unregistered there's nothing connecting it to a specific person. Stolen or unregistered firearms purchased through a strawman from gun shows are one of the primary reasons so many shootings go unprosecuted in the US every year. A lot of the stuff you see on CSI is an exaggeration, it's fairly easy to clean a machined, metal surface.