The two fundamental laws of gun studies are: One, if a given author reaches a pro- or anti-gun result in one study, all his future results will point in the same direction; two, if it appears in a public-health journal, the results will suggest guns are bad. . . .
What we have learned is this: A bunch of states started letting almost any random person walk around a gun, and if anything good or bad resulted, it doesn’t reliably show up in the data.
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