Cal. Food & Agr. Code § 461
The department may conduct surveys or investigations of any nursery, orchard, vineyard, agricultural commodity, agricultural appliance, farm, or other premises within the state liable to be infested or infected with any pest as defined in Section 5006 or disease, including any infectious, transmissible, and contagious diseases of livestock and poultry, for the purpose of detecting the presence of, or determining the status of, the pest or disease. The director and the county agricultural commissioner shall consult concerning these surveys or investigations and in the conduct or implementation of any control or eradication activity when the provisions of this code provide joint responsibilities in connection with the pest or disease.
Ca. Food and Agric. Code § 461