How ignition interlock devices really work: A practical guide

Facing a DUI in Nevada often brings an ignition interlock device (IID) requirement and that can raise a lot of questions. This guide breaks down how IIDs work, why they’re required and what to expect.

What is an IID and why is it needed?

In Nevada, many DUI convictions mandate an IID.  It is a small breathalyzer that mounts near your ignition and won’t let your car start unless your breath alcohol content (BrAC) is below a set level (usually around .02). It’s meant to keep intoxicated drivers off the road while still letting you drive legally.

How do they work?

If you’re required to install an IID, it’s helpful to understand how the system works and what to expect. Here’s a breakdown of how this device operates:

• Startup breath test: Before the engine turns over, you’ll inhale then blow into the device.
• Rolling retests: While driving, the IID may request random breath samples to ensure continued sobriety.
• Engine safety: The device won’t shut off the car mid-drive, but it may trigger alarms if you miss a retest or if you test positive.

Modern IIDs often include record-keeping and may include cameras to verify the driver.

How long must it stay installed?

Nevada law determines the duration based on your DUI history. The following timelines reflect common durations ordered after DUI convictions:

• First or second offense (<.18): At least 185 days
• First or second offense (>=.18): 12-36 months

Keep in mind that the timeline may vary, especially if the court grants an exemption or modifies the order based on your specific case.

What about maintenance and violations?

Your device must be inspected at least once every 90 days throughout the installation period to ensure proper calibration.

Additionally, failure to pass a test, skip a retest or tampering can extend IID time or may lead to jail term or revocation of driving privileges.

Can I install one voluntarily?

Yes, installing an IID voluntarily or even before a DUI could help demonstrate responsibility and may affect future consequences. However, if you’re required to do so, you’ll need a court or DMV order.

What you need to know

IIDs are more than just pricey gadgets. They’re a legal tool to keep roads safe and to help you keep driving but under strict rules. Understanding how they operate, what happens if you miss a test and how long they stay on your vehicle can help you stay on the right side of the law.