Zero Tolerance Zero tolerance for Commercial Motor Vehicle Drivers It's unlawful for the operator of a commercial motor vehicle to drink and drive. The first offense results in a 10 day disqualification to operate a commercial motor vehicle. The second or subsequent offense revokes the drivers license to operate any vehicle. Zero tolerance for school bus and school activity bus drivers and child care vehicle drivers drivers. It is unlawful for school bus and school activity bus drivers and child care vehicle operators (day care van etc.) to drink and drive. Zero tolerance for those under age 21 North Carolina takes a zero-tolerance stance against drivers who are under the legal drinking age but drank or used drugs illegally and then got behind the wheel. People under age 21 simply cannot drive with any alcohol or illegally-used drugs in their systems -- period. Any amount of alcohol will result in an immediate 30 day pretrial revocation. If an underage drinking driver refuses to take such a test, he or she now need only have the smell of alcohol on the breath to be convicted of driving after drinking. Offenders will have their licenses revoked for one year but can get limited driving privileges instated by a judge if the driver was at least 18 years old at the time of the offense and did not have a prior conviction.