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6th Circuit strikes down ATF "bump-stock" determination

The case is Gun Owners of America v. Garland, handed down today. The big issue was Chevron deference, under which a court defers to an agency interpretation of an ambiguous law. A couple of wonderful quotes:

"Notwithstanding the ATF's frequent reversals on major policy issues, we understand that the Court would consider the bureaucrats at the ATF as experts in firearms technology. But that technical knowledge is inapposite to the question of what should be criminally punished and what should not."

"Consistent with our precedent and mandated by separation-of-powers and fair-notice concerns, we hold that an administering agency's interpretation of a criminal statute is not entitled to Chevron deference. Consequently, the district court erred by finding that the ATF's Final Rule, which interpreted the meaning of a machine gun as defined in 26 U.S.C. § 5845(b), was entitled to Chevron deference. And because we find that "single function of the trigger" refers to the mechanical process of the trigger, we further hold that a bump stock cannot be classified as a machine gun because a bump stock does not enable a semiautomatic firearm to fire more than one shot each time the trigger is pulled. Accordingly, we find that Plaintiffs-Appellants are likely to prevail on the merits and that that their motion for an injunction should have been granted."