Specific to dirks, switchblades and bowies:
§ 18.2-309. Furnishing certain weapons to minors; penalty.
A. If any person sells, barters, gives or furnishes, or causes to be sold, bartered, given or furnished, to any minor a dirk, switchblade knife or bowie knife, having good cause to believe him to be a minor, such person shall be guilty of a Class 1 misdemeanor.