Connecticut’s Ignition Interlock Device Law

Connecticut rolled out its IID law in 2015, mandating that individuals with multiple OUI convictions must install these devices in their vehicles. Since then, the requirement has expanded, and now anyone facing a license suspension due to an OUI or DUI offense is likely required to use an IID for a set period.

If you're dealing with this situation or just trying to understand how IIDs work, here’s a breakdown of what you need to know.

What Is an Ignition Interlock Device?

An ignition interlock device is installed in a vehicle after a drunk or drugged driving offense. Before starting the car, the driver must blow into the device to check their blood alcohol content (BAC). If the BAC is above a certain threshold—usually 0.025%—the car won't start. This data is also sent to the DMV through a built-in chip.

But the process doesn’t end there. Throughout the drive, the device may prompt the driver for a “rolling retest” to ensure they remain sober while operating the vehicle.

In Connecticut, when an IID is installed, the following rules apply:

• The device prevents the engine from starting if the BAC is 0.025% or higher, though this limit can be lower for drivers under 21.
• All vehicles you own and operate must have an IID installed.
• You’re required to have the device calibrated every 25–30 days by an approved installer.
• Failing to calibrate the device on time could lead to another license suspension.
• Tampering with the device, driving without one, or having someone else blow into it for you can result in serious consequences, including license revocation.
• The device sends alerts to the DMV if you fail a retest or have a BAC over 0.05%.
• There are costs involved. You’ll typically pay $175 to reinstate your license and another $100 for administrative fees related to the IID.

License Suspension and Using an IID

Even if you haven’t been convicted, an arrest for DUI or OUI can still require you to install an IID. For adults, this applies at a BAC of 0.08%, and for those under 21, at 0.02%. The IID is part of the process to regain your driving privileges.

To get back on the road, you’ll need to apply for a Special Operator’s Permit before your current suspension ends. Typically, the suspension begins 30 days after your arrest and lasts 45 days. Once that period is over, you can apply to have your license reinstated—but only if you have an IID installed.

The length of time you need to keep the device depends on your age and the number of offenses:

• Under 21: 1 year for a first offense, 2 years for a second, and 3 years for a third.
• 21 and older:
  • First Conviction: 45-day suspension, followed by at least one year of IID use.
  • Second Conviction: 45-day suspension plus three years of IID use, with restricted trips during the first year.
  • Third Conviction: Permanent license suspension, but you can appeal after three years.

Additionally, refusing an OUI test—whether it’s a breath, blood, or urine test—also requires an IID installation. This applies even if you were not convicted, and it also includes cases involving vehicular assault or manslaughter.

Importantly, the IID period starts from the date your license is restored—not when the device is actually installed. However, if you receive another suspension while using the device, the timeline will reset based on the new incident.

If you're working to get your license back after a DUI or OUI, DaSilva’s Auto Body can help. We specialize in installing ignition interlock devices and can guide you through the process. Contact us today to schedule an appointment and take the next step toward regaining your driving privileges.

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