Cal. Business and Professions Code § 22949.64

(a) Notwithstanding any other law, the requirements of this chapter shall be enforced exclusively through the private civil actions described in Section 22949.65. No enforcement of this chapter may be taken or threatened by this state, a political subdivision, a district or county or city attorney, or an executive or administrative officer or employee of this state or a political subdivision against any person, except as provided in Section 22949.65. (b) The fact that conduct violates this chapter shall not be an independent basis for enforcement of any other law of this state, or the denial, revocation, suspension, or withholding of any right or privilege conferred by the law of this state or a political subdivision, or a threat to do the same, by this state, a political subdivision, a district or county or city attorney, or an executive or administrative officer or employee of this state or a political subdivision, or a board, commission, or similar body assigned authority to do so under law, against any person, except as provided in Section 22949.65. Nor shall any civil action predicated upon a violation of this chapter be brought by this state, a political subdivision, a district or county or city attorney, or an executive or administrative officer or employee of this state or a political subdivision. For avoidance of doubt, the rights and privileges described by this subdivision include, but are not limited to, any business licenses and permits issued pursuant to this code or any firearms, ammunition, or precursor parts dealer or vendor licenses issued pursuant to Title 4 (commencing with Section 23500) of Part 6 of the Penal Code. This subdivision shall not be construed to prevent or limit enforcement of any other law regulating conduct that also violates this chapter, including, but not limited to, Chapter 1.5 (commencing with Section 30400) and Chapter 2 (commencing with Section 30500) of Division 10 of Title 4 of Part 6 of the Penal Code. (c) Subdivisions (a) and (b) shall not be construed to do any of the following: (1) Legalize the conduct prohibited by this chapter or by Chapter 1.5 (commencing with Section 30400) and Chapter 2 (commencing with Section 30500) of Division 10 of Title 4 of Part 6 of the Penal Code. (2) Waive any requirements prescribed in Chapter 3 (commencing with Section 29180) of Division 7 of Title 4 of Part 6 of the Penal Code. (3) Limit or affect the availability of a remedy established by Section 22949.65. (4) Limit the enforceability of any other laws that regulate or prohibit any conduct relating to firearms or firearm precursor parts.