California Code, Penal Code - PEN § 22810

(e)(1) No person shall purchase, possess, or use any tear gas weapon that expels a projectile, or that expels the tear gas by any method other than an aerosol spray, or that contains more than 2.5 ounces net weight of aerosol spray.

(2) Every tear gas container and tear gas weapon that may be lawfully purchased, possessed, and used pursuant to this section shall have a label that states: “WARNING: The use of this substance or device for any purpose other than self-defense is a crime under the law. The contents are dangerous--use with care.”

(3) After January 1, 1984, every tear gas container and tear gas weapon that may be lawfully purchased, possessed, and used pursuant to this section shall have a label that discloses the date on which the useful life of the tear gas weapon expires.

(4) Every tear gas container and tear gas weapon that may be lawfully purchased pursuant to this section shall be accompanied at the time of purchase by printed instructions for use.

(g)(1) Except as provided in paragraph (2), any person who uses tear gas or any tear gas weapon except in self-defense is guilty of a public offense and is punishable by imprisonment pursuant to subdivision (h) of Section 1170 for 16 months, or two or three years or in a county jail not to exceed one year or by a fine not to exceed one thousand dollars ($1,000), or by both the fine and imprisonment.

(2) If the use is against a peace officer, as defined in Chapter 4.5 (commencing with Section 830) of Title 3 of Part 2, engaged in the performance of official duties and the person committing the offense knows or reasonably should know that the victim is a peace officer, the offense is punishable by imprisonment pursuant to subdivision (h) of Section 1170 for 16 months or two or three years or by a fine of one thousand dollars ($1,000), or by both the fine and imprisonment.