Tennessee Ignition Interlock Device (IID) Requirements

Misdemeanor DWI Court Programs in Tarrant County are specialized dockets designed to treat the underlying addiction of repeat offenders.

Ignition Interlock Device (IID) Requirements in Tennessee

An Ignition Interlock Device (IID) is a breathalyzer installed in a vehicle that prevents it from starting if the driver's breath alcohol content (BAC) exceeds a pre-set limit. Tennessee law mandates the use of IIDs for certain DUI offenders. Here's a breakdown of the requirements:

When Required

Tennessee law generally requires IIDs for repeat DUI offenders. While specific criteria can vary based on the circumstances of the case, an IID is typically mandated in the following situations:

• Repeat DUI Offenses: Individuals convicted of a second or subsequent DUI offense are typically required to install an IID in their vehicles.
• High BAC: Although this research is specific to Texas, the concept of a "high BAC" threshold (.15) influencing monitoring is relevant. Tennessee judges may consider BAC levels when determining IID requirements. While not explicitly codified as triggering a mandatory IID in all cases, a high BAC can lead to stricter sentencing and increased likelihood of IID installation, even for a first offense.
• Court Discretion: Even in cases where an IID is not strictly mandated by law, a judge may order its installation as a condition of probation or a restricted driver's license.

Duration

The duration for which an IID is required varies based on the number of prior DUI convictions:

• Second Offense: Typically requires IID installation for a period of one year to the length of revocation.
• Third Offense: Installation required for a period of one to ten years.
• Fourth or Subsequent Offense: Installation required for the length of revocation, generally eight years.

These durations are general guidelines, and the specific length of time can be influenced by factors like the severity of the offense and the offender's compliance with court orders.

How It Works

Understanding the operation of an IID is crucial for compliance. Here's how it typically works:

• Before Starting: The driver must blow into the device before starting the vehicle. The IID analyzes the breath sample for alcohol content. If the BAC is below the pre-set limit (typically .02 or .025), the vehicle will start.
• Rolling Retests: While driving, the IID will require periodic "rolling retests." The driver will be prompted to provide another breath sample while the vehicle is in motion. Failure to provide a sample or a reading above the limit will trigger a violation.
• Violation Triggers:
• Failing the Initial Breath Test: Attempting to start the vehicle with a BAC above the limit.
• Failing a Rolling Retest: Failing to provide a sample or providing a sample above the limit while driving.
• Tampering with the Device: Attempting to disconnect, bypass, or otherwise disable the IID.
• Circumventing the Device: Having someone else provide a breath sample to start the vehicle.
• Missed Service Appointments: Failing to bring the vehicle in for regular maintenance and calibration.

Costs

The costs associated with IID installation and maintenance are the responsibility of the offender. The specific costs can vary depending on the provider and the type of device, but generally include:

• Installation Fee: An initial fee to install the device in the vehicle. Based on Texas estimates, this could range from $75 to $200.
• Monthly Lease/Monitoring Fee: A recurring monthly fee to lease the device and cover monitoring costs. This can range from $60 to $100 per month.
• Calibration Fee: Periodic fees to calibrate the device and ensure its accuracy. These are usually required every 30 to 60 days.
• Removal Fee: A fee to remove the device at the end of the required period.
• Violation Fees: Fees may be assessed for violations such as failed breath tests or tampering with the device.

State-Approved Providers

Tennessee maintains a list of state-approved IID providers. It is essential to choose a provider from this list to ensure compliance with the law. While specific providers change, contacting the Tennessee Department of Safety and Homeland Security or your probation officer is the best way to obtain a current list.

Violations

Violating the terms of the IID program can have serious consequences:

• Extension of IID Requirement: The period for which the IID is required may be extended.
• Suspension or Revocation of Driver's License: The driver's license may be suspended or revoked.
• Jail Time: In some cases, violations can result in jail time.
• Probation Violation: If the IID requirement is a condition of probation, a violation can lead to probation revocation.

It's important to note that some providers may require the installation fee plus the first two weeks of monitoring (approximating $200 based on Texas vendors) upfront before installing the device. Failure to pay this at the initial appointment can lead to a bond violation. Failure to keep up with daily fees can also result in the vendor notifying the court of "non-compliance."

For more information and assistance navigating Tennessee IID requirements, contact the Tennessee Department of Safety and Homeland Security at 615-251-5166.