It upheld the principle that states have control of local issues, like gun possession on school grounds. Lopez was charged in a one-count indictment with violating 18 USC § 922(q), which makes it illegal to possess a firearm in a school zone.GOLDBERG, Judge: Appellant Lopez complains that the roving border patrol stop of his vehicle violated the fourth amendment. The Gun-Free School Zones Act of 1990 made the knowing possession of a firearm in a school zone a crime under federal law. The supreme court sided with lopez in a 5-4 decision and here's the reasoning from the majority opinion. The Supreme Court decided in a 5-4 decision that Lopez was correct. The Act neither regulates a commercial activity nor contains a requirement that the possession be connected in any way to interstate commerce. The Gun-Free School Zones Act of 1990 made the knowing possession of a firearm in a school zone a crime under federal law. The issue in this case is whether the Commerce Clause authorizes Congress to enact a statute that makes it a crime to possess a gun in, or near, a school. A 12th grade student (Lopez) was convicted of violating the Act when he brought a handgun to his high school.