Only temporarily. Congress passed a revised Gun Free School Zones Act, and that (revised) law has been upheld by Federal Courts of Appeal; as a permissible exercise of the Commerce Clause power.
Still can possess in school zone if :
An individual who has been issued a right-to-carry license by the state, or a political subdivision of the state, in which the “school zone” is located may continue to carry in a “school zone” in compliance with existing state and local laws. Non-licensed individuals who drive through a “school zone” must have their firearms unloaded and locked in a container or firearms rack.