Final answer:
A driver may be required to install an ignition interlock device after their first DUI conviction or after multiple DUI convictions, depending on local laws.
Step-by-step explanation:
The requirement to install an ignition interlock device (IID) after a DUI (Driving Under the Influence) conviction varies by jurisdiction. In many places, a driver may be required to install an IID after their first DUI conviction, especially if their blood alcohol concentration was significantly above the legal limit, or if other aggravating factors were present. However, some regions may require an IID after multiple DUI convictions. It's critical to consult local laws for the most accurate information, as the specifics can differ considerably from one place to another.