California Code, Public Resources Code - PRC § 4022

(a) The titles of ranger, park ranger, and forest ranger, and derivations thereof, may only be used by persons who are peace officers under Chapter 4.5 (commencing with Section 830) of Title 3 of Part 2 of the Penal Code, employees of the Department of Forestry and Fire Protection, or employees of the Department of Parks and Recreation classified as State Park Ranger (Permanent Intermittent).  Any person, other than a peace officer or employee of the Department of Parks and Recreation, as described in this section, or employee of the Department of Forestry and Fire Protection, who willfully wears, exhibits, or uses any authorized badge, insignia, emblem, device, label, title, or card of a ranger, park ranger, forest ranger, or a derivation thereof, to identify the person as a ranger, park ranger, or forest ranger, or who willfully wears, exhibits, or uses any badge, insignia, emblem, device, label, title, or card of a ranger, park ranger, or forest ranger, which so resembles the authorized version that it would deceive an ordinary, reasonable person into believing that it is authorized for the use of a ranger, park ranger, or forest ranger, is guilty of a  1 infraction.

(b) Subdivision (a) does not apply to positions and titles of agencies of the United States government or to any local agency which is officially using any title specified in subdivision (a) as of January 1, 1990.