A driver under the age of 21 who is convicted of driving under the influence (DUI) for the _______ time may be required to have an ignition interlock device installed on his or her vehicle.

A driver under the age of 21 who is convicted of driving under the influence (DUI) for the first time may be required to have an ignition interlock device installed on his or her vehicle. [Under 21 – Alcohol Restriction, Section 6: Dangerous Driving Behaviors, Maryland Driver's Manual]