745 ILCS 49/10
An individual who is trained in CPR and, in good faith and without compensation, provides emergency CPR will not be held legally responsible for acting or failing to act. They can be held legally responsible if acting with intent to cause harm.
Cardiopulmonary resuscitation; exemption from civil liability for emergency care
Any person trained in basic cardiopulmonary resuscitation who has successfully completed training in accordance with the standards of the American Red Cross or the American Heart Association and who in good faith, not for compensation, provides emergency cardiopulmonary resuscitation in accordance with his or her training to a person who is an apparent victim of acute cardiopulmonary insufficiency shall not, as the result of his or her acts or omissions in providing resuscitation, be liable for civil damages, unless the acts or omissions constitute willful and wanton misconduct.