2005 California Penal Code Sections 12580-12583 Article 4. Blowguns

12580.  "Blowgun," as used in this article, means a hollow tube
designed and intended to be used as a tube through which a dart is
propelled by the force of the breath of the user.
12581.  "Blowgun ammunition," as used in this article, means a dart
designed and intended for use in a blowgun.
12582.  Any person who knowingly manufactures, sells, offers for
sale, possesses, or uses a blowgun or blowgun ammunition in this
state is guilty of a misdemeanor.
12583.  Nothing in this article shall prohibit the sale to, purchase
by, possession of, or use of blowguns or blowgun ammunition by
zookeepers, animal control officers, Department of Fish and Game
personnel, humane officers whose names are maintained in the county
record of humane officers pursuant to Section 14502 of the
Corporations Code, or veterinarians in the course and scope of their
business in order to administer medicine to animals.