How would being able to track down a serial number help solve crimes? If a gun is used at another crime site, would the criminal leave a note with the serial number, make, and model, and caliber they used? Serial numbers are only good for 1 thing, to track down the original owner and RETURN the gun back to them. But many times it takes a long time, if at all to return a gun to the original owner who reported it stolen. It's held as evidence. And if your gun was used in a murder, would you want it back with the bad juju that it has on it?
Guns used in crimes are quickly sold back on the black market so the ballistics can't be traced back to the shooter. And when this is done, the resale value drops. So it could have changed hands many times from the first time it was used in a crime. Had a special about this on Drugs Inc on NatGeo.
Registration serves only 1 purpose, confiscation.
There is another purpose: to keep a record of firearms each law abiding person owns so that it can be used against them.
If a crime was committed with a .357, and I happen to own a .357, it causes my name to jump up on the list of possible suspects based on no other evidence. No firearm recovered at the scene, no prints on a weapon, no DNA recovered -- just the fact I own the right caliber gun makes me appear more guilty.
Hell, let's REALLY make law enforcement's job easier!! I think we should send all federal, state, and local law enforcement agencies:
a sample of our DNA,
fingerprints,
copies of our tax returns, both federal and state,
copies of all our statements for savings, checking, credit card, and investment accounts,
copies of our medical records,
copies of all our life, health, auto and homeowners/renters insurance policies and claims,
copies of our cell phone records and landline if any still exist,
college transcripts,
high school transcripts,
audio and video recordings from any home surveillance devices we own on a periodic basis,
copies of everything we post on any and all online sites especially if it's political in nature,
and the names and contact information for family, friends, co-workers, classmates, teachers and other associates since we were 16 years old.
The police have an important and difficult job to do. This is the least we can do to ensure we have an orderly and safe society. Civil rights can be forfeited in the name of public safety. All the cool Socialist countries are doing it!