Cal. Health and Safety Code § 110140

For purposes of enforcement of this part, any authorized agent of the department may, upon presenting appropriate credentials and at a reasonable time, do any of the following: (a) Enter any factory, warehouse, or establishment in which any food, drug, device, or cosmetic is manufactured, packed, or held; enter any vehicle that is being used to transport or hold the food, drug, device, or cosmetic; or enter any place where any food, drug, device, or cosmetic is suspected of being held in violation of this part. (b) Inspect any factory, warehouse, establishment, vehicle, or place, and all pertinent equipment, raw material, finished and unfinished materials, containers, and labeling in the factory, warehouse, establishment, vehicle, or place. In the case of any factory, warehouse, establishment, or consulting laboratory in which any food, drug, device, or cosmetic is manufactured, packed, or held, inspection shall include any record, file, paper, process, control, and facility that has a bearing on whether the food, drug, device, or cosmetic is adulterated or misbranded, or falsely advertised within the meaning of this part or whether it has been or is being manufactured, packed, transported, sold, or offered for sale in violation of this part.