Cal. Penal Code § 4574

(a) Except when otherwise authorized by law, or when authorized by the person in charge of the prison or other institution referred to in this section or by an officer of the institution empowered by the person in charge of the institution to give such authorization, any person, who knowingly brings or sends into, or knowingly assists in bringing into, or sending into, any state prison or prison road camp or prison forestry camp, or other prison camp or prison farm or any other place where prisoners of the state prison are located under the custody of prison officials, officers or employees, or any jail or any county road camp in this state, or within the grounds belonging or adjacent to any such institution, any firearms, deadly weapons, or explosives, and any person who, while lawfully confined in a jail or county road camp possesses therein any firearm, deadly weapon, explosive, tear gas or tear gas weapon, is guilty of a felony and punishable by imprisonment pursuant to subdivision (h) of Section 1170 for two, three, or four years. (b) Except as provided in subdivision (a), any person who knowingly brings or sends into those places any tear gas or tear gas weapons which results in the release of such tear gas or use of such weapon is guilty of a felony and punishable by imprisonment pursuant to subdivision (h) of Section 1170 for two, three, or four years. (c) Except as provided in subdivision (a), any person who knowingly brings or sends into those places any tear gas or tear gas weapons is guilty of a misdemeanor and punishable by imprisonment in the county jail not exceeding six months, or by fine not exceeding one thousand dollars ($1,000), or by both such fine and imprisonment.