Final answer:
After a second or third DWI conviction, depending on the state, you must have an ignition interlock device installed in each vehicle you operate before your driving privileges can be reinstated.
Step-by-step explanation:
If you are convicted of DWI more than once, the law in many states requires the installation of an ignition interlock device (IID) in each vehicle you operate before your driving privileges can be reinstated. Specifically, some laws indicate that after a second offense (b), or sometimes a third (c), an IID must be installed.
However, this can vary by state so it is important to consult local laws for the specific requirements in your area. Ignition interlock devices are used as a preventative measure to keep those convicted of DWI from operating a vehicle while impaired, as the vehicle will not start if a certain level of alcohol is detected in the driver's breath.