An en banc panel of the U.S. Court of Appeals for the Ninth Circuit on Tuesday weighed whether a constitutional challenge to Hawaii’s law banning butterfly knives is moot after the state legislature revised the language to allow possession of the weapons at home and openly.

Last August, a three-judge panel ruled that Hawaii’s ban on “butterfly knives” violated the Second Amendment, finding the pocketknife-esque blade falls under the definition of “arms.”