Evidence

A party may interrogate any unwilling or hostile witness by leading questions. A party may call an adverse party and interrogate him by leading questions and contradict and impeach him in all respects as if he had been called by the adverse party, except by evidence of bad character, and the witness thus called may be contradicted and impeached by or on behalf of the adverse party also, and may be cross-examined by the adverse party only upon the subject matter of his examination in chief. Any other witness may be cross-examined without regard to the scope of his testimony on direct, subject only to the trial judge's sound discretion.