California Code, Penal Code - PEN § 490.6

(a) A person employed by an amusement park may detain a person for a reasonable time for the purpose of conducting an investigation in a reasonable manner whenever the person employed by the amusement park has probable cause to believe the person to be detained is violating lawful amusement park rules.

(b) If any person admitted to an amusement park refuses or fails to follow lawful amusement park rules, after being so informed, then an amusement park employee may request that the person either comply or leave the premises. If the person refuses to leave the premises or comply with lawful park rules, then the person shall be deemed to be intentionally interfering with and obstructing those attempting to carry on a lawful business within the meaning of Section 602.1.

(c) In any civil action brought by any person resulting from a detention or an arrest by a person employed by an amusement park, it shall be a defense to that action that the amusement park employee detaining or arresting the person had probable cause to believe that the person was not following lawful amusement park rules and that the amusement park employee acted reasonably under all the circumstances.