Cal. Penal Code § 23025

A permit issued in accordance with this chapter may be revoked or suspended by the issuing authority at any time when it appears that the need for the possession or transportation of the tear gas or tear gas weapon or protective system involving the use thereof, has ceased, or that the holder of the permit has engaged in an unlawful business or occupation or has wrongfully made use of the tear gas or tear gas weapon or the permit issued.