There is no standard judgment or outcome for a person in your friend's situation. Unfortunately, your post does not state which controlled substance your friend is accused of trafficking. However, the punishment for this type of offense is not based on whether the person has committed a similar offense in past. It is based exclusively on the quantity of drugs the person is accused of trafficking. So, for example, a person who possesses 28 - 199 grams of cocaine is facing 35 to 42 months in prison. To find out what your friend is facing, you should read North Carolina General Statute 90-95.
An experience drug defense attorney may be able to help your friend avoid a mandatory sentence. For example, an attorney may be able to convince a judge to suppress incriminating evidence, which could lead to a dismissal of the charge.