Cal. PEN § 4573.5

Any person who knowingly brings into any state prison or other institution under the jurisdiction of the Department of Corrections, or into any prison camp, prison farm, or any other place where prisoners or inmates of these institutions are located under the custody of prison or institution officials, officers, or employees, or into any county, city and county, or city jail, road camp, farm or any other institution or place where prisoners or inmates are being held under the custody of any sheriff, chief of police, peace officer, probation officer, or employees, or within the grounds belonging to any institution or place, any alcoholic beverage, any drugs, other than controlled substances, in any manner, shape, form, dispenser, or container, or any device, contrivance, instrument, or paraphernalia intended to be used for unlawfully injecting or consuming any drug other than controlled substances, without having authority so to do by the rules of the Department of Corrections, the rules of the prison, institution, camp, farm, place, or jail, or by the specific authorization of the warden, superintendent, jailer, or other person in charge of the prison, jail, institution, camp, farm, or place, is guilty of a felony.

The prohibitions and sanctions addressed in this section shall be clearly and prominently posted outside of, and at the entrance to, the grounds of all detention facilities under the jurisdiction of, or operated by, the state or any city, county, or city and county.