Cal Civ Code 1714.2
Liability: Use of CPR
An individual trained in basic CPR who, in good faith, provides CPR at the scene of an emergency or an agency, organization, or person who provides or supervises CPR training will not be held legally responsible for acting or failing to act. They can be held legally responsible if acting with extreme carelessness.
Civil Liability of person rendering emergency care
(a) In order to encourage citizens to participate in emergency medical services training programs and to render emergency medical services to fellow citizens, no person who has completed a basic cardiopulmonary resuscitation course which complies with the standards adopted by the American Heart Association or the American Red Cross for cardiopulmonary resuscitation and emergency cardiac care, and who, in good faith, renders emergency cardiopulmonary resuscitation at the scene of an emergency, shall be liable for any civil damages as a result of any acts or omissions by such person rendering the emergency care. (b) This section shall not be construed to grant immunity from civil damages to any person whose conduct in rendering such emergency care constitutes gross negligence. (c) In order to encourage local agencies and other organizations to train citizens in cardiopulmonary resuscitation techniques, no local agency, entity of state or local government, or other public or private organization which sponsors, authorizes, supports, finances, or supervises the training of citizens in cardiopulmonary resuscitation shall be liable for any civil damages alleged to result from such training programs. (d) In order to encourage qualified individuals to instruct citizens in cardiopulmonary resuscitation, no person who is certified to instruct in cardiopulmonary resuscitation by either the American Heart Association or the American Red Cross shall be liable for any civil damages alleged to result from the acts or omissions of an individual who received instruction on cardiopulmonary resuscitation by that certified instructor. (e) This section shall not be construed to grant immunity from civil damages to any person who renders such emergency care to an individual with the expectation of receiving compensation from the individual for providing the emergency care.