30 Chapter 2 — Alcohol and the Law If you are convicted of DWI while your license is revoked for an earlier  DWI conviction, the court may order your vehicle seized and sold. If you are convicted of DWI: Blood Alcohol Concentration Restrictions Alcohol and the Young Driver The law requires a one-year driver license revocation upon conviction for: The legal age to purchase any alcoholic beverage in North Carolina is 21. It is  against the law for any person who is younger than 21 years of age to purchase  or to attempt to purchase alcohol. Furthermore, a conviction of Driving While Impaired with a BAC of 0.15 or  more, or another conviction within the past seven years, will require an ignition  interlock device to be installed on the vehicle. On the first restoration, the alcohol concentration restriction will be 0.04. On  a second or subsequent restoration, the alcohol concentration restriction will be  0.00. Additionally, if you are convicted of DWI in a commercial motor vehicle,  driving after consuming alcohol or drugs while under the age of 21 or felony  death by vehicle, the alcohol concentration restriction will be 0.00. A blood alcohol concentration restriction will be required when a license is  restored following a suspension for DWI or when a Limited Driving Privilege is  issued following a DWI conviction. First conviction:  Mandatory revocation of your driver license for a period of  one year. Second conviction:  Mandatory driver license revocation for a period of four  years when convicted of a prior offense which occurred within three years of the  current offense for which the license is being revoked. Third conviction:  Mandatory, permanent driver license revocation if at least  one of the prior convictions occurred within the past five years. Fourth conviction:  Mandatory permanent driver license revocation. The  fourth conviction is considered a felony if the three prior DWI convictions  occurred within the past seven years.  • Any underage person who attempts to purchase or purchases an alcoholic beverage; • Attempt to punish DWI offenders, but also try to help them deal with  problems they may have with alcohol; • Require that repeat DWI offenders or persons with high BACs be checked to  see if they have an alcohol problem; • Require persons with lower BACs to attend alcohol safety schools; and • Require anyone convicted of DWI to obtain a substance abuse assessment  prior to the reinstatement of driving privileges.