In this case false positives are far, far worse than false negatives. A false negative in this system does not mean a tragedy will occur, because there are many other preventative measures in place. And never mind the fact that this country refuses to even address the primary cause of gun violence in the first place: the ubiquity of guns in our society. So systems like this is what we end up with when we ignore to address the problem of guns and choose to deal the downstream effects of that instead.