Tell me this? How would you solve the US gun issues?
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I would make it so each bullet is embedded with a unique identifier - for easy tracing back to the person that bought it. First offense for carrying a gun during the commission of a crime would be a mandatory life sentence of riding the bus 24x7 wearing only a diaper. I would make it so you could not buy bullets for less than $10,000 each - people will think twice before pulling the trigger.
Ok, far more lunacy than I expected in your answer, but I'll humor you.
The technology for unique bullet identifiers does not exist, unless you're talking about a serial number or etching. So let's rule out electronic solutions right from the get-go unless you know of something that will work. If you do, please point me to it. Don't bother with RFID or other type technology, as none of that would stand up to the kinetic impact of a bullet hitting something.
Coincidentally, this would also make etchings impossible, for several reasons. First, a bullet can be linked to a particular gun because of the impression left by the barrel in the lead. This same impression would render any etching unreadable. Second, the aforementioned kinetic impact of bullets frequently crushes them and fragments them, making such an impression worthless if it somehow survived the scraping from exiting the barrel.
Lastly, making bullets $10,000 each is the hallmark suggestion of someone who knows nothing about firearms. It is not that difficult to reload your own bullets if you know how to do it. All you would do is create a vast, criminal market in illegal bullets. Google "ammunition reload kit" for more info and then come back when you know what you're talking about.
Oh, and it's
already illegal to commit a crime with a firearm, and most crimes are committed by illegally owned firearms. If you're going to commit murder and commit a crime with an illegally obtained firearm, do you really care that you're risking riding a bus in a diaper? How fucking stupid.