It is a debated question in Medical Jurisprudence whether the Doctor's professional knowledge of criminal acts should be privileged before the courts, so that he should not be forced to testify to a crime that he has learned from his patients while acting as their medical adviser. Dr. Ewell speaks thus on the subject (p. 2): "The medical witness should remember that, by the common law, a medical man has no privilege to avoid giving in evidence any statement made to him by a patient; but when called upon to do so in a court of justice, he is bound to disclose every communication, however private and confidential, which has been made to him by a patient while attending him in a professional capacity. By statute, however, in some of the United States, communications made by a patient to a physician when necessary to the treatment of a case are privileged; and the physician is either expressly forbidden or not obliged to reveal them. Such statutes exist in Arkansas, California, Indiana, Iowa, Ohio, Michigan, Minnesota, Missouri, Montana, New York, and Wisconsin. The seal upon the physician's lips is not even taken away by the patient's death. Such communications, however, must be of a lawful character and not against morality or public policy; hence, a consultation as to the means of procuring an abortion on another is not privileged, nor would be any similar conference held for the purpose of devising a crime or evading its consequences. "A report of a medical official of an insurance company on the health of a party proposing to insure his life is not privileged from production; nor is the report of a surgeon of a railroad company as to the injuries sustained by a passenger in an accident, unless such report has been obtained with a view to impending litigation." The practical rule for a Doctor's conscience on the subject of secrecy is, that he must keep his professional secrets with great fidelity, and not reveal them except in as far as he is compelled to do so by a court of justice acting within its legal power or competency. If so compelled, he can safely speak out; for his duty to his patient is understood to be dependent on his obedience to lawful authority.