N.C. Gen. Stat. § 15A-277

An order to appear pursuant to this Article may be served by a law-enforcement officer. The order must be served upon the person named or described in the affidavit by delivery of a copy to him personally. The order must be served at least 72 hours in advance of the time of compliance, unless the judge issuing the order has determined, in accordance with G.S. 15A-274, that delay will adversely affect the probative value of the evidence sought or when it appears likely that the person named in the order may destroy, alter, or modify the evidence sought, or may not appear.