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Question:

After you regain driving privileges following your second DWI conviction, you may not drive with a blood alcohol concentration (BAC) above

A zero.
Explaination

After you regain driving privileges following your second or subsequent DWI conviction, you may not drive with a blood alcohol concentration (BAC) greater than zero. You will be required to install an ignition interlock device (IID) on every vehicle you operate. The IID will monitor your blood alcohol concentration (BAC) and prevent your vehicle from starting if your BAC exceeds zero. [Blood Alcohol Concentration Restrictions, Chapter 2 – Alcohol and the Law, North Carolina Driver's Handbook]