



When is an Ignition Interlock Device Required?
In Texas, not everyone convicted of a DWI will automatically be required to install an Ignition Interlock Device. However, certain situations make the installation of the device mandatory. If someone is a first-time offender with a blood alcohol concentration (BAC) of 0.15 percent or higher, they will likely be required to install an IID. Repeat DWI offenders are also more likely to face this requirement. The court may decide that a driver with multiple DWI convictions needs an IID to continue driving. There are cases where an IID is required to avoid a driver’s license suspension. A person may be offered the option to continue driving with an IID installed rather than losing their driving privileges entirely. Additionally, if someone has a DWI conviction that involves serious injury or death, they may be ordered to have the device installed as part of their punishment.How Does an Ignition Interlock Device Work?
An Ignition Interlock Device is installed in the driver’s vehicle, and it is directly connected to the car’s ignition system. Before the car starts, the driver must blow into the device to provide a breath sample. The IID measures the amount of alcohol in the driver’s breath. If the driver’s BAC is above a certain level, which is usually set at 0.03 percent, the device will prevent the car from starting. The driver must also provide breath samples while driving. This is known as a rolling retest. At random times during the trip, the IID will alert the driver to blow into the device again. If alcohol is detected during one of these retests, the device may set off an alarm, and the violation will be reported to the monitoring authorities. These measures are designed to ensure that the driver is sober not only at the beginning of the trip but throughout the time they are operating the vehicle.
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Criminal Defense Attorney
Douglas Wilder
Attorney Douglas Wilder has always stayed on the cutting edge of training and attending seminars to ensure he has the most knowledge he can to represent his clients. This has led him to be recognized as one of the Best Lawyers under 40 in Dallas by D magazine, and also recognized as a Super Lawyer for 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2021, 2022, & 2023. .
