No, that seems like a lazy technologist approach of reflexively hanging your hat on database queries. Police do actual police work like physically collecting evidence, seeing if they indicate any particular kind of gun or known ballistics, reconstructing the encounter, etc.
Also FWIW in MA firearms aren't licensed, rather their owners are. And ownership isn't registered, rather many types of transfers are supposed to be recorded.
You’re assuming I meant anything about checking against a database. I meant more that casings found at the scene should be compared to casing of bullets fired from guns of his known associates.
Granted, even if you find such matches, you still have to prove motive and opportunity.
Also FWIW in MA firearms aren't licensed, rather their owners are. And ownership isn't registered, rather many types of transfers are supposed to be recorded.