North Carolina General Statutes Chapter 15. Criminal Procedure § 15-173. Demurrer to the evidence

When on the trial of any criminal action in the superior or district court, the State has introduced its evidence and rested its case, the defendant may move to dismiss the action, or for judgment as in case of nonsuit.  If the motion is allowed, judgment shall be entered accordingly;  and such judgment shall have the force and effect of a verdict of “not guilty” as to such defendant.  If the motion is refused and the defendant does not choose to introduce evidence, the case shall be submitted to the jury as in other cases, and the defendant may on appeal urge as ground for reversal, the trial court's denial of his motion without the necessity of the defendant's having taken exception to such denial.

If the defendant introduces evidence, he thereby waives any motion for dismissal or judgment as in case of nonsuit which he may have made prior to the introduction of his evidence and cannot urge such prior motion as ground for appeal.  The defendant, however, may make such motion at the conclusion of all the evidence in the case, irrespective of whether or not he made a motion for dismissal or judgment as in case of nonsuit theretofore.  If the motion is allowed, or shall be sustained on appeal, it shall in all cases have the force and effect of a verdict of “not guilty.”  If the motion is refused, the defendant may on appeal, after the jury has rendered its verdict, urge as ground for reversal the trial court's denial of his motion made at the close of all the evidence without the necessity of the defendant's having taken exception to such denial.