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How Do “Smart Start” Interlock Devices Work?

DUI charges often include more than just legal penalties. An individual’s driving privileges might be suspended or revoked, and before they can drive again, they might have an ignition interlock device (IID) installed in their car. The Smart Start interlock device is one of the most common of these instruments.

What Is a Smart Start Interlock Device?

A Smart Start interlock device is a breathalyzer that is installed in a vehicle to keep a person from driving if their blood alcohol concentration (BAC) is above a certain level. They’re often required by courts for those who have been convicted of DUI violations. They ensure that such drivers aren’t able to drive while intoxicated, thereby reducing the risk of future incidents.

How Does the Device Work?

A Smart Start device works by integrating advanced breathalyzer technology with your vehicle’s ignition system. Before you can start your car, you’ll need to blow into the device using a certain technique, usually a pattern of blowing, humming, or both. 

The device will measure your BAC and compare it to its pre-programmed limit, which is typically set to either 0.02% or 0.04%. If the device detects a level higher than that, the car won’t start. It is only when the provided breath sample is below the limit that the engine will start and let the driver operate it as usual. 

Once the car is moving, the device might request random breath samples, also known as “rolling retests.” These are administered to prevent the driver from drinking once the car is started. If you fail or refuse a rolling retest, the device will log the incident and might trigger an alert, such as honking or flashing lights, to encourage you to pull over.

The device keeps detailed logs of every interaction, and it sends that information to the overseeing authority, be it the court, DMV, or your probation officer. These logs are often checked to ensure that the driver remains in compliance with the terms of their DUI sentence or license reinstatement.

Components and Advantages of Smart Start Interlock Devices

To fully understand how a Smart Start interlock device works, it helps to know its main components. These include the following:

  • Handheld Unit: The breathalyzer itself; often mounted near the driver’s seat
  • Ignition Interlock Module: Communicates with your vehicle’s ignition system
  • Display Screen: Shows instructions for the user, such as when to provide a sample or when a rolling retest is required
  • Camera: Not always available; prevents tampering or the use of another person’s breath by taking a photo every time a sample is given

By preventing drivers from starting their cars after drinking alcohol, Smart Start interlock devices help reduce the chances of repeat DUI offenses. At the same time, they put restrictions in place that still allow a person to legally drive so long as they meet the court’s requirements.

Having an interlock device installed in your car can be daunting, even frustrating, at first. However, the device’s most modern incarnations are meant to be user-friendly, complete with clear prompts and simple instructions. And ultimately, they are intended to help you stay accountable and on track with your legal obligations.

A Path To Safer Roads and Driver Accountability

A Smart Start interlock device is designed to promote responsible driving habits, especially after a DUI conviction. These tools attempt to bring additional accountability to drivers who have practiced unsafe behaviors in the past. With them, the legal system aims to prevent drunk driving and contribute to safer roads for everyone.

Contact our DUI Law Firm of Ahmed & Sukaram, Criminal Defense Attorneys Today For Help

For more information, please contact our criminal defense law firm of Ahmed & Sukaram, Criminal Defense Attorneys, at the nearest location for a free consultation.

Ahmed & Sukaram, Criminal Defense Attorneys – San Jose Office
1625 The Alameda, Suite 405, San Jose, CA 95126
(408) 217-8818

Ahmed & Sukaram, Criminal Defense Attorneys – Redwood City Office
600 Allerton St Suite 201G, Redwood City, CA 94063
(650) 299-0500

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