N.C. Gen. Stat. § 301
In all civil actions and proceedings when not otherwise provided for by statute, by judicial decision, or by these rules, a presumption imposes on the party against whom it is directed the burden of going forward with evidence to rebut or meet the presumption, but does not shift to such party the burden of proof in the sense of the risk of nonpersuasion, which remains throughout the trial upon the party on whom it was originally cast. The burden of going forward is satisfied by the introduction of evidence sufficient to permit reasonable minds to conclude that the presumed fact does not exist. If the party against whom a presumption operates fails to meet the burden of producing evidence, the presumed fact shall be deemed proved, and the court shall instruct the jury accordingly. When the burden of producing evidence to meet a presumption is satisfied, the court must instruct the jury that it may, but is not required to, infer the existence of the presumed fact from the proved fact.
N.C. Gen. Stat. § 301