What You Need to Know About Interlock Devices After a DUI in Tennessee

Understanding the Role of Interlock Devices in the DUI Process

If you’ve been charged with a DUI in Tennessee, especially in Sumner County, there’s a good chance you’ll need an interlock device installed on your vehicle. What was once the exception has now become the rule due to stricter DUI laws and increased lobbying around public safety.

What Is an Interlock Device?

An interlock device is essentially a breathalyzer installed in your vehicle. You must blow into it to start your car, and the vehicle will not operate if alcohol is detected. These devices are now required in most DUI cases—even first offenses.

In the past, interlocks were only mandated in severe DUI situations, such as when there was an accident or a child was in the car. Today, they are a standard part of DUI sentencing in Tennessee.

How Do You Get One?

Once arrested for DUI, you’ll likely begin receiving promotional materials from interlock companies. These businesses track DUI arrests and often send out mailers with coupons or discounts. As your attorney, I often collect and share these offers with clients to make the process more affordable.

If we expect a guilty plea—which is common due to the prevalence of blood evidence and toxicology reports—it’s a good idea to install the interlock device the day before your court appearance. This ensures you're prepared and compliant.

Steps to Get Your Restricted License:

1. Get SR-22 Insurance: This is proof of liability insurance.

2. Install the Interlock Device: Choose a provider and complete installation before court.

3. Obtain a Driving Order: I’ll prepare and file this order, which the judge signs after your plea.

4. File with the Clerk: After court, you’ll go to the clerk’s office, pay a $25 fee, and receive two certified copies of the order.

5. Visit the DMV: Present one copy to the DMV to obtain your restricted license.

With that driving order, you’re allowed to drive for 10 days while waiting for your official restricted license.

Why the Interlock Isn’t All Bad

There’s a silver lining—if you’re a first-time offender, an interlock-equipped vehicle often means no geographic restrictions. That means you’re not limited to just commuting to work or school. You can drive to the grocery store, take your kids to school, go to the doctor, attend football games, or even go to concerts.

However, for second or third offenses, even with an interlock, the court may still impose driving restrictions.

DUI cases can feel overwhelming, but you don’t have to navigate the process alone. At Ingrum Law Firm, PLLC, we help clients understand each step—from getting SR-22 insurance and installing an interlock to walking you through the restricted license process. Our goal is to make things as smooth and stress-free as possible so you can move forward with your life.