Every person who, having been previously convicted of a felony and confined in any state prison in this state, without the consent of the officer in charge of any California Youth Authority institution comes upon the grounds of any such institution, or lands belonging or adjacent thereto, in the nighttime, and who refuses or fails to leave upon being requested to do so by an employee of the institution, is guilty of a misdemeanor.
Ca. Welf. and Inst. Code § 1001.7