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After a person has been charged with a DUI (driving under the influence), it’s normal for their license to be suspended. On its return, most states stipulate the installation of an ignition interlock system. This device, which operates like a breathalyzer, checks for alcohol on the driver's breath and will prevent the vehicle from starting if detected. If you’ve recently been convicted of driving drunk and ordered to install one of these devices, this guide will explain what you can expect.

How Does an Ignition Interlock System Work?

To prevent future drunk driving, the system is connected to the vehicle's ignition. In order to start your vehicle, you'll have to blow into the device. If it does not detect alcohol, it will allow the car to start; if it does, it will time out, and you'll have to try again later. Each time you fail this initial try, the system will make you wait an additional amount of time. 

ignition interlock systemOnce the car has started, most states have laws that require the driver to retest at periodic times during the vehicle operation. Usually, this is signaled by beeping or another alert sound. If it notes alcohol in your system, the device will start sounding the horn and flashing the lights to get you to stop the vehicle. 

How Long Will the Ignition Interlock System Have to Remain in the Vehicle?

You'll usually be told how long the device has to remain in your vehicle during court sentencing. The length can vary from one state to the next and will largely depend on the charge and past convictions. Some states do not currently require an ignition interlock device for first-time offenders, but most do have lengthened requirements for those who have received multiple DUIs. Tennessee requires the device for all offenses and mandates that it is in place for at least a year and a half beginning with the license suspension. 

The data of your tests is also sent to the proper authorities. If you return multiple failures, it could end up lengthening how long the device is required to remain in your vehicle.


If you need a reliable ignition interlock system to maximize road safety, contact Tennessee Recovery & Monitoring based in Cleveland, TN. They provide legal entities, behavioral health organizations, and residential programs with a range of alcohol monitoring systems. They carry SMART START® ignition interlock devices, which are made to exceed National Highway Traffic Administration standards. Learn more about other products and services by calling them today at (855) 472-7269 or by visiting their website. 

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