California Code, Penal Code - PEN § 23000

The Department of Justice may issue a permit for the possession and transportation of tear gas or a tear gas weapon that is not intended or certified for personal self-defense purposes, upon proof that good cause exists for issuance of the permit to the applicant.  The permit may also allow the applicant to install, maintain, and operate a protective system involving the use of tear gas or a tear gas weapon in any place that is accurately and completely described in the permit application.