California Code, Health and Safety Code - HSC § 1670

Nothing contained in this chapter shall be construed to limit or restrict the right of counties, cities, cities and counties, towns or townships, to adopt or enforce ordinances or other regulations regulating the use or procurement of animals for diagnostic procedures or medical research, and any such ordinances or regulations now in effect are not affected by this chapter. It is the intent of this chapter to provide state regulation of the use of animals in diagnostic procedures and medical research concurrently with and supplementary to local regulations, but not to preclude the exercise by counties, cities, cities and counties, towns or townships, of such regulatory power as they may possess in this field under the Constitution and statutes of this State.