There are three main impaired driving offenses teens and young adults should know about:
Of the three, only UDD is specifically for people younger than 21, and is related to alcohol only. The UDD is a Class A for the 1st offense but raises to a misdemeanor for subsequent offenses.
Driving impaired by marijuana, prescription drugs, or illicit drugs will lead to a charge of DWAI or DUI.
The level for DWAI is .050 to .079 pursuant to statute.