What article does not prohibit

Va. Code Ann. § 18.2-303.1, under Chapter 7. Crimes Involving Health and Safety..

Va. Code Ann. § 18.2-303.1

Nothing contained in this article shall prohibit or interfere with the possession of a "sawed-off" shotgun or "sawed-off" rifle for scientific purposes, the possession of a "sawed-off" shotgun or "sawed-off" rifle possessed in compliance with federal law or the possession of a "sawed-off" shotgun or "sawed-off" rifle not usable as a firing weapon and possessed as a curiosity, ornament, or keepsake.