They are 100% legal, per the letter of the law. They meet no criteria for gravity knives, switch blades, or ballistic knives. Specifically, spring assisted knives open via manual pressure applied to a tab connected to the blade. Whereby, at a specific point the spring helps fully deploy the blade. In no way, however, does the spring or tab singularly open the knife or allow for the blade of the knife to become a ballistic projectile. The only thing you might run into is the 3.5" blade rule, which is ridiculous in its own right.