California Code, Business and Professions Code - BPC § 4856

(a) All records required by law to be kept by a veterinarian subject to this chapter, including, but not limited to, records pertaining to diagnosis and treatment of animals and records pertaining to drugs or devices for use on animals, shall be open to inspection by the board, or its authorized representatives, during an inspection as part of a regular inspection program by the board, or during an investigation initiated in response to a complaint that a licensee has violated any law or regulation that constitutes grounds for disciplinary action by the board. A copy of all those records shall be provided to the board immediately upon request.

(b) Equipment and drugs on the premises, or any other place, where veterinary medicine, veterinary dentistry, veterinary surgery, or the various branches thereof is being practiced, or otherwise in the possession of a veterinarian for purposes of that practice, shall be open to inspection by the board, or its authorized representatives, during an inspection as part of a regular inspection program by the board, or during an investigation initiated in response to a complaint that a licensee has violated any law or regulation that constitutes grounds for disciplinary action by the board.