Look, let's say that instead of leaving bullets/cartridges at the crime scene the criminal left the actual gun. Wouldnt that make things easier? The gun already has a unique serial number that can be traced from the factory to the end retail buyer.
So they do that and call Mr. Smith, the end retail buyer to ask him where he was on the night of the 21st. Mr. Smith answers "if you're calling about my gun, I reported it stolen two weeks ago."
End of trail.
How will this work any better with ammo, which is small, easily exchanged with other ammo of similar type and caliber, and easily lost without having to report it stolen or missing? It wont.
Again, no one has produced ammo using any of the systems mentioned here. I tend to think SAAMI, which has a century of experience collectively in ammunition manufacture, knows what it is talking about. Certainly more so than a company that makes skateboards.
Further, the amount of numbers necessary will be staggering. I do not know how many cartridges are produced per day but I would bet the yearly production is in the billions or more. What are the logistics of assigning a unique number in the billions or trillions?
And finally, even if CA passes such a bill, would ammo makers really see such a bonanza and rush to retool to untried, unproven, and expensive technology to satisfy the whim of one state legislature, knowing that the idea is a turkey from the start? No, I dont think so.
But it is heartening that so many on this board are perfectly prepared to believe the California State Legislature's assertions in this matter.