Cal. Penal Code § 290.020

In any case in which a person who would be required to register pursuant to the Act for a felony conviction is to be temporarily sent outside the institution where he or she is confined on any assignment within a city or county including firefighting, disaster control, or of whatever nature the assignment may be, the local law enforcement agency having jurisdiction over the place or places where the assignment shall occur shall be notified within a reasonable time prior to removal from the institution. This section shall not apply to any person who is temporarily released under guard from the institution where he or she is confined.