If they're criminals, then they've already broken laws. Is an armed robber going to care about a gun regulation? Is a murderer?
Gun regulations are intended to ensnare the otherwise law-abiding citizen.
I’m not sure how this could ensnare the law abiding citizen, though.
True, criminals will find a way around this, but some criminals are not as smart or as careful as others. That’s why we find fingerprints at crime scenes. That’s why surveillance cameras sometimes help.
If you can put away enough of these criminals using this technology, then there will be less pressure to take away rights from law abiding citizens.
To me, though, the question is what you’re going to do to these guys once you’ve got them. If you’re just going to give them a slap on the wrist, then why bother?