(2)(A) It shall be unlawful for any individual knowingly to
possess a firearm that has moved in or that otherwise affects
interstate or foreign commerce at a place that the individual
knows, or has reasonable cause to believe, is a school zone.
(B) Subparagraph (A) does not apply to the possession of a
(i) on private property not part of school grounds;
(ii) if the individual possessing the firearm is licensed to do
so by the State in which the school zone is located or a
political subdivision of the State, and the law of the State or
political subdivision requires that, before an individual obtains
such a license, the law enforcement authorities of the State or
political subdivision verify that the individual is qualified
under law to receive the license;
And for the definition of a school zone: \http://www.law.cornell.edu/uscode/text/18/921
(25) The term “school zone” means—
(A) in, or on the grounds of, a public, parochial or private school; or
(B) within a distance of 1,000 feet from the grounds of a public, parochial or private school.
(26) The term “school” means a school which provides elementary or secondary education, as determined under State law.