Jurors not to be questioned for verdicts

§ 14. Jurors not to be questioned for verdicts. A juror shall not be
questioned, and is not subject to an action, or other liability civil or
criminal, for a verdict rendered by him, in an action in a court of
record, or not of record, or in a special proceeding before an officer,
except by indictment, for corrupt conduct, in a case prescribed by law.