SNIP - ALITO DISSENTING OPINION Maj. Op. at ----. In other words, the majority argues in effect that the private, purely intrastate possession of machine guns has a substantial effect on the interstate machine gun market. This theory, if accepted, would go far toward converting Congress's authority to regulate interstate commerce into "a plenary police power." Lopez, --- U.S. at ----, 115 S.Ct. at 1633. If there is any sort of interstate market for a commodity--and I think that it is safe to assume that there is some sort of interstate market for practically everything--then the purely intrastate possession of...