Common ignition interlock device (IID) questions in Tennessee?

What Tennessee Drivers Need to Know About Ignition Interlock Devices After a DUI Arrest

If your bond conditions require it, if you’re convicted of DUI in Tennessee or seeking a Restricted Driver’s License, you’ll likely need to install an Ignition Interlock Device (IID). This isn’t optional. Here’s what you need to know to stay compliant and avoid additional penalties.

When Is an Ignition Interlock Device Required?

In Tennessee, an IID is generally required for:

• As a condition of bond.
• Anyone convicted of DUI who wants to drive legally during their license suspension.
  
• Drivers seeking a Restricted Driver’s License after a DUI conviction.
  
• Some cases involving refusal of chemical testing under the Implied Consent Law (TCA § 55-10-406).
  

The court or the Department of Safety will provide clear instructions if an IID is required as a condition of driving privileges.

When is an interlock ignition device a requirement of bond conditions?

When facing a Tennessee charge for Driving Under the Influence (DUI) or a related offense—such as Vehicular Assault by Intoxication, Aggravated Vehicular Assault by Intoxication, Vehicular Homicide by Intoxication, or Aggravated Vehicular Homicide—the court may require the accused to drive only vehicles equipped with a functioning ignition interlock device (IID) as part of their bond conditions.

In fact, if the DUI offense involved alcohol, the court must order the installation of an IID by default if any of the following factors are present:

• The offense involved a crash that caused property damage;
  
• A minor was a passenger in the vehicle during the alleged DUI;
  
• The driver’s license had previously been suspended for violating Tennessee’s Implied Consent Law; OR
  
• The driver has a prior conviction for any of these Tennessee offenses:
  
  • Reckless Driving (T.C.A. §55-10-205);
    
  • Reckless Endangerment (T.C.A. §39-13-103);
    
  • DUI (T.C.A. §55-10-401);
    
  • Vehicular Assault (T.C.A. §39-13-106);
    
  • Aggravated Vehicular Assault (T.C.A. §39-13-115);
    
  • Vehicular Homicide (T.C.A. §39-13-213(a)(2));
    
  • Aggravated Vehicular Homicide (T.C.A. §39-13-218).
    

Legal Reference: T.C.A. §40-11-118(d)(1)(A).

What If I Don’t Own a Car?

In Nashville, if you’re on bond conditions and don’t have a vehicle then you must tell the person monitoring you that you don’t have a car. They have a form to complete to stay in compliance with your bond conditions. 

After you plead guilty or are found guilty at trial, you still have to comply with the ignition interlock requirement—owning a vehicle or not. Tennessee law is clear: you must maintain and demonstrate one full year of IID compliance before you will ever be eligible to drive legally again.

That means if you don’t currently have a vehicle, you need to get one and install the IID to begin the compliance clock. Sitting out your suspension period without complying with the IID order won’t help you get your license back. The year doesn’t start until you install the device in a vehicle you drive.

You may be able to borrow a car with the owner’s consent of course or use an alternative to IID. Some alternatives are Portable Alcohol Monitoring Device (SMART Mobile) or an ankle monitor. Your court might sign you up for a portable device like SMART Mobile, which is a court-ordered product and not something you can choose yourself. 

The most important thing is to find a way to complete this so you can legally drive.

Can I Drive Another Vehicle Without an IID?

No. If you’re under a court or Department of Safety order to have an IID, you may not operate any vehicle that doesn’t have one installed—even if it belongs to someone else. You must notify your employer and carry documentation in the vehicle at all times.

The penalty for driving a vehicle without a device is 11 months and 29 days jail with 48 hours minimum jail to serve. 

Can Someone Else Drive My IID-Equipped Vehicle?

Yes. Others can operate your vehicle, but they will be required to blow into the IID just like you would. If they fail the test, you’re the one who could face consequences, even if you weren’t the driver at the time.

What If I Sell My Car With an IID Installed?

If you’re still under an IID order, you must have the device professionally removed and reinstalled in your new vehicle. You can’t just take it out yourself or stop driving without notifying the court or Department of Safety. Any unauthorized removal can be reported and may jeopardize your compliance status.

Is the IID Camera Recording Me All the Time?

No. The camera only activates when you’re prompted to provide a breath sample. It’s there to protect you. If someone else tries to blow into the IID on your behalf and fails, the camera helps prove you weren’t the one violating the terms.

How Does the Court Monitor My Compliance?

Tennessee-approved IID providers submit regular reports detailing your usage, any violations, or missed calibrations. These reports can go directly to your probation officer, attorney, or the court—but only if you’ve signed a release of information. Make sure your attorney has helped you handle this step to avoid any communication gaps.

Final Thought: Don’t Take Chances With IID Compliance

Violating IID requirements—or delaying them—can cost you even more time, freedom, and money. If you’ve been told to install an IID, take action now. Whether you have a car or not, your eligibility to legally drive again depends on starting and maintaining your ignition interlock period.

Call 615-NASH-LAW for a Free DUI Strategy Session

At Nash Law PLLC, we believe DUI defense is more than courtroom strategy, it’s personal. We help great people fight DUI charges and come out stronger on the other side. We hold your hand every step of the way.

We’re not just here to win your DUI case, we’re here to help you get your life back on track better than when you or your loved one got arrested for DUI. 

• Fast answers.
• Clear strategies.
• Fierce DUI defense.

Call us now at 615-NASH-LAW (615-627-4529) or fill out our online form for your Free Strategy Session to see if we’re a good fit. We hold our client’s hand every step of the way.

We Help Great People Fight Their DUI Charges.©️