Ignition Interlock Device (IID): Everything You Need to Know

Ignition Interlock Device (IID): Everything You Need to Know

If you’ve been charged with a DUI in California, you may have heard about the Ignition Interlock Device (IID). This device plays a crucial role in the rehabilitation process and helps ensure that drivers refrain from operating a vehicle under the influence. In this post, we’ll explore everything you need to know about IIDs, including California laws, requirements, and how they can affect your driving record.

What is an Ignition Interlock Device (IID)?

An Ignition Interlock Device (IID) is a breathalyzer installed in a vehicle that requires the driver to provide a breath sample before starting the engine. If the IID detects alcohol on the driver’s breath, the vehicle will not start. This technology is designed to prevent individuals convicted of DUI from operating a vehicle while intoxicated.

California Laws Regarding IIDs

In California, the IID requirement stems from the state’s efforts to reduce repeat DUI offenses. Here are some key aspects of the law:

• According to California Vehicle Code Section 13352, individuals convicted of a DUI may be mandated to install an IID in their vehicle for a period of 6 months to 2 years, depending on the severity of their offense.
• First-time offenders with a blood alcohol concentration (BAC) of 0.15% or higher are required to have an IID installed for at least 6 months.
• Repeat offenders are subject to longer IID requirements — up to 3 years for their second DUI and up to 4 years for subsequent offenses.
• California law mandates that individuals must maintain the IID for the entire duration of their suspension or restriction period.

Who Needs an IID?

Not everyone convicted of a DUI will need to install an IID. Generally, the requirement applies to:

• Those with a BAC of 0.08% or higher.
• Individuals with prior DUI convictions.
• Drivers involved in accidents while under the influence.

It’s crucial to check your specific case with a qualified attorney or the DMV to understand your requirements fully.

How to Obtain an IID

Once you’re mandated to install an IID, follow these steps:

1. Choose a certified IID provider. The California DMV maintains a list of approved IID manufacturers and service providers.
2. Schedule an appointment for installation. This typically takes about an hour.
3. Complete the installation and ensure that you understand how to use the device correctly.
4. Maintain regular service appointments as required, usually every 30 to 60 days.

Costs Associated with IIDs

Installing and maintaining an IID can be costly. Here are some typical expenses you might incur:

• Installation fee: Generally ranges from $70 to $150.
• Monthly monitoring fees: Typically between $60 and $100.
• Calibration fees: May be required every few months, costing around $20 to $50 each time.

Keep in mind that while these fees can add up, they are often less than the costs associated with a DUI conviction, including fines, legal fees, and increased insurance premiums.

Impact of an IID on Your Driving Record

Having an IID installed can impact your driving record in several ways:

• It serves as a reminder of the consequences of driving under the influence.
• Successful completion of the IID requirement can demonstrate to the court that you are taking responsibility for your actions and may help in obtaining a restricted license.
• Failure to comply with IID laws can lead to additional penalties, including license suspension or revocation.

Getting Your License Back After IID Installation

Once your IID requirement is complete, you can work on getting your driving privileges reinstated. Here are the steps to follow:

1. Ensure your IID is removed by a certified provider, and obtain a compliance certificate.
2. Visit the DMV to submit your compliance certificate and pay any necessary fees.
3. Consider completing a DUI program if mandated, as it may facilitate the reinstatement of your license.

Common Myths About IIDs

There are many misconceptions surrounding IIDs. Here are a few:

• Myth: IIDs are only required for repeat offenders. Fact: First-time offenders with a high BAC may also be required to use an IID.
• Myth: IIDs are easy to circumvent. Fact: Modern IIDs have advanced technology to prevent tampering and ensure accurate readings.
• Myth: IIDs must be used in every vehicle. Fact: You only need an IID in vehicles you own or operate regularly.

IID Vendor Comparison: Intoxalock vs Smart Start vs LifeSafer

California has several DMV-approved IID providers. Here's how the three most popular compare:

Intoxalock

Largest network (5,500+ service centers). Simple blow-inhale-blow breath pattern. $1.96-$3.50/day. 24/7 customer support. Optional $10/mo device protection plan. Best for: most California drivers due to service center density and simplest breath pattern.

Smart Start

~2,000 locations. Uses blow-hum-blow pattern (harder to master). Has a "warn" result tier. Good EV/Tesla compatibility. Pricing starts ~$1.99/day (call for quote). Best for: electric vehicle drivers.

LifeSafer

~2,000 locations. Lowest battery drain (4x less than Intoxalock in standby). Same-day installation guarantee. Blow-and-hum pattern. $2.50-$3.50/day. Best for: EV/hybrid owners worried about battery drain, or anyone needing fast installation.

Low-Income Assistance: All providers must offer California's mandated assistance program. You pay 10% if income ≤100% federal poverty level, 25% if 101-200%, 50% if 201-300%.

DUI-Help.org members get discounted IID installation through our partner network — learn more.

IID False Positives: What Causes Them and What to Do

False positives happen more than people expect. Common causes:

• Mouthwash (Listerine is 26% alcohol — switch to alcohol-free for IID period)
• Energy drinks, kombucha, fermented foods (trace ethanol)
• GERD/acid reflux (pushes stomach contents into mouth, creating "mouth alcohol")
• Cold/cough medications (many liquid meds contain alcohol)
• Dental appliances/dentures (trap residual mouth alcohol)
• Diabetes/ketoacidosis (produces acetone that devices can misread as ethanol)

If you get a false positive: rinse mouth with water, wait a few minutes, retest. A clean retest after a short wait supports a false positive explanation. Document what you ate/used in the previous 30 minutes. Contact your IID provider immediately. Tell your attorney. Don't panic after a single incident — what triggers serious DMV action is a pattern, not one isolated event.

IID on Electric Vehicles

If you drive a Tesla or other EV, IID installation is possible but requires a provider with EV experience. Intoxalock and Smart Start handle some Tesla models. LifeSafer has the lowest standby battery drain. Always confirm your specific vehicle model with the provider before committing. The IID draws power even when parked, so battery drain is a real concern for EV owners.

IID Requirement When You Don't Own a Car

If you don't own a vehicle but have an IID requirement, you generally need to get a vehicle with an IID installed to satisfy the restriction. A non-owner SR-22 policy alone usually won't satisfy an IID requirement. Options include: installing an IID on a family member's vehicle (with their permission), leasing a vehicle and installing the IID, or applying for an exemption through the DMV if you can demonstrate you truly have no access to any vehicle. Contact the DMV Mandatory Actions Unit at (916) 657-6525 for your specific situation.

Rolling Retests While Driving

After starting your car, the IID will require periodic breath samples while driving (rolling retests). If you fail or miss a rolling retest, the device will log the event and activate an alarm (lights/horn), but it will NOT shut off your engine mid-drive. Pull over safely and provide a clean sample. The failed attempt is logged and reported at your next calibration visit, but a clean follow-up provides context that matters.

Conclusion

Understanding the requirements and implications of having an Ignition Interlock Device is crucial for anyone facing DUI charges in California. Adhering to IID regulations not only helps you regain your driving privileges but also plays a significant role in reducing future DUI incidents on the road.

If you have further questions about IIDs, SR-22 insurance, or the DUI process in California, don’t hesitate to reach out to us. Our team is here to assist you every step of the way.

Stay informed, stay safe, and make responsible choices on the road!