Carolina Law Bloghttps://www.youtube.com/watch?v=67Xh_t1Bg9I
It is unlawful for a person less than 21 years old to drive a motor vehicle on a highway or public vehicular area while consuming alcohol or at any time while he has remaining in his body any alcohol or controlled substance previously consumed, but a person less than 21 years old does not violate this section if he drives with a controlled substance in his body which was lawfully obtained and taken in therapeutically appropriate amounts.
Modified Transcript of “Provisional DWI in NC” for the Hearing Impaired NCGS 20-138.3: