This could all ready easily be done man. Mine user info then check everyone who has made a sale or bought a gun and sell that list. Would be long enough to keep any criminal organisation very busy for a long time. This system adds security without any real extra risk.
Also it's worth noting that it's pretty hard to hack an I eternal system like that and that most of that sort of data leak happens at the head office, either by someone visiting the building, but more commonly by a pissed off staff member.
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