It has long been recognized that a privilege to act is a perfect defense to liability for a non-consensual, intentional interference with another person. This privilege is based upon self defense, defense of third persons, mistake, or various other recognized legal theories. Even a state may have a privilege to interfere with the person of a citizen, and this privilege may extend to an interference to provide an infant citizen with medical care without the consent of, or against the express wishes of, the parent or guardian