California Code, Business and Professions Code - BPC § 4840.6

Any registered veterinary technician registered in this state who in good faith renders emergency animal health care at the scene of the emergency, or his or her employing veterinarian or agency authorized under Section 4840.9, shall not be liable for any civil damages as the result of acts or omissions by a registered veterinary technician rendering the emergency care.  This section shall not grant immunity from civil damages when the registered veterinary technician is grossly negligent.