California Code, Penal Code - PEN § 22815

(a) Notwithstanding subdivision (d) of Section 22810, a minor who has attained the age of 16 years may purchase and possess tear gas or a tear gas weapon pursuant to this division if the minor is accompanied by a parent or guardian, or has the written consent of a parent or guardian.

(b) Notwithstanding subdivision (c) of Section 22810, a person may sell or furnish tear gas or a tear gas weapon to a minor who has attained the age of 16 years and who is accompanied by a parent or guardian, or who presents a statement of consent signed by the minor's parent or guardian.

(c) Any civil liability of a minor arising out of the minor's use of tear gas or a tear gas weapon other than for self-defense is imposed upon the parent, guardian, or other person who authorized the provision of tear gas to a minor by signing a statement of consent or accompanying the minor, as specified in subdivision (b). That parent, guardian, or other person shall be jointly and severally liable with the minor for any damages proximately resulting from the negligent or wrongful act or omission of the minor in the use of the tear gas or a tear gas weapon.