If you are under 21 years old, it is illegal to drive or operate a vehicle with a BAC of .02 or above. This is a “zero tolerance” type of law. You are not permitted to buy or consume alcohol as a minor, so the legislature wants to deter and punish any underage driving. If you are 21 years or older, then the BAC limit is .08 or above.
If you are convicted of a DUI and were under 21 years old at the time of the offense, the judge must send you to a chemical dependency evaluation before he or she can sentence you. You will have to pay for this evaluation. An alcohol or drug counselor will interview you and go over your history. Once complete, the counselor will submit to the court any recommendations for the length and type of treatment as part of your sentencing. This can include drug testing, AA and counseling, which will be in addition to the other court requirements.
With such a low per se BAC limit of .02, you should not even attempt to drive a vehicle after having a drink if you are under 21 years old.
This is for informative purposes only. Always seek legal counsel. This does not create an attorney-client relationship.