California Code, Penal Code - PEN § 6130

(b) Upon a request by an incarcerated person, publisher, or other affected person, the Office of the Inspector General may review a publication on the Centralized List of Disapproved Publications to determine if the office concurs with the department's determination that the publication is in violation of department regulations. The office shall notify the department if the office does not concur with the department's determination that a publication that the office has reviewed pursuant to this subdivision is in violation of the department's regulations.

(c) For purposes of this section, “publication” means any newspaper, periodical, magazine, or book that can be mailed through the United States Postal Service.