If a law enforcement officer swears that a driver has refused a legal chemical test, the Division of Motor Vehicles must:

When a law enforcement officer attests that a driver has refused a legal chemical test, North Carolina law mandates that the Division of Motor Vehicles (DMV) must revoke the driver's license for at least 12 months. This rule is a part of the state's implied consent laws, which state that by operating a motor vehicle on public roads, a driver automatically consents to chemical testing when suspected of driving under the influence.

If a driver refuses to comply with this testing, it reflects a violation of these consent laws, triggering a mandatory revocation of their driving privileges. The rationale behind this strict penalty is to deter individuals from refusing chemical tests, which are essential for law enforcement to ascertain impairment levels and promote road safety standards.

The other options are not applicable in instances of refusal of a chemical test; therefore, they do not align with the consequences stipulated by North Carolina law in this scenario.