California Penal Code, Section 243.8:

When a battery is committed against a sports official immediately prior to, during, or immediately following an interscholastic, intercollegiate, or any other organized amateur or professional athletic contest in which the sports official is participating, and the person who commits the offense knows or reasonably should know that the victim is engaged in the performance of his or her duties, the offense shall be punishable by a fine not exceeding two thousand dollars ($2,000), or by imprisonment in the county jail not exceeding one year, or by both that fine and imprisonment.

(b) For purposes of this section, “sports official” means any individual who serves as a referee, umpire, linesman, or who serves in a similar capacity but may be known by a different title or name and is duly registered by, or a member of, a local, state, regional, or national organization engaged in part in providing education and training to sports officials.

(Added by Stats. 1991, Ch. 575, Sec. 1.)

California Penal Code, Section 243.83:

(a) It is unlawful for any person attending a professional sporting event to do any of the following:

(1) Throw any object on or across the court or field of play with the intent to interfere with play or distract a player.

(2) Enter upon the court or field of play without permission from an authorized person any time after the authorized participants of play have entered the court or field to begin the sporting event and until the participants of play have completed the playing time of the sporting event.

(b) (1) The owner of the facility in which a professional sporting event is to be held shall provide a notice specifying the unlawful activity prohibited by this section and the punishment for engaging in that prohibited activity.

(2) The notice shall be prominently displayed throughout the facility or may be provided by some other manner, such as on a big screen or by a general public announcement. In addition, notice shall be posted at all controlled entry areas of the sporting facility.

(3) Failure to provide the notice shall not be a defense to a violation of this section.

(c) For the purposes of this section, the following terms have the following meanings:

(1) “Player” includes any authorized participant of play, including, but not limited to, team members, referees however designated, and support staff, whether or not any of those persons receive compensation.

(2) “Professional sporting event” means a scheduled sporting event involving a professional sports team or organization or a professional athlete for which an admission fee is charged to the public.

(d) A violation of subdivision (a) is an infraction punishable by a fine not exceeding two hundred fifty dollars ($250). The fine shall not be subject to penalty assessments as provided in Section 1464 or 1465.7 of this code or Section 76000 of the Government Code.

(e) This section shall apply to attendees at professional sporting events; this section shall not apply to players or to sports officials, as defined in Section 243.8.

(f) Nothing in this section shall be construed to limit or prevent prosecution under any applicable provision of law.

(Added by Stats. 2003, Ch. 818, Sec. 1. Effective January 1, 2004.)

California Penal Code, Section 243.85:

The owner of any professional sports facility shall post, visible from a majority of the seating in the stands at all times, at controlled entry areas, and at parking facilities that are part of the professional sports facility, written notices displaying the text message number and telephone number to contact security in order to report a violent act.

(Added by Stats. 2012, Ch. 261, Sec. 1. (AB 2464) Effective January 1, 2013.)