The court may direct prior to the start of jury selection that one or more jurors in addition to the regular jury of twelve persons be called and impaneled. The additional jurors shall be drawn in the same manner, shall have the same qualifications, shall be subject to the same examination and challenges, shall take the same oath, and shall have the same functions, powers, facilities, and privileges as the regular jurors. If one or more additional jurors are called, each party is entitled to one peremptory challenge for each such additional juror, up to the maximum provided by law. Such additional peremptory challenges may be used against any regular or additional juror. The trial court in its discretion may use either of the following methods to select and impanel additional jurors:
Tenn. R. Civ. P. 47.02