What Is an Ignition Interlock Device (IID)?
An ignition interlock device (IID), sometimes called a car breathalyzer, is a small breath-testing device connected to a vehicle's ignition. Before the engine starts, the driver provides a breath sample. If the device detects alcohol at or above its programmed set point, the vehicle will not start. An IID may also request additional samples while the vehicle is being driven.
Arizona drivers should think of an IID as one part of a larger compliance program. The device records test events, while the Arizona Motor Vehicle Division (MVD) and other supervising agencies determine the program requirements and administrative consequences that apply to an individual driver.
Contact Budget IID to discuss your Arizona IID installation and next steps.
How Does an Ignition Interlock Device Work?
An IID checks a breath sample before the vehicle starts and may request additional samples while the vehicle is being driven.
For more practical testing and service questions, review the Budget IID ignition interlock FAQs.
Device-Level Events vs. Arizona MVD Program Consequences
What Happens at the Device Level
The IID responds to a breath sample or a retest prompt. A positive breath result can prevent the next engine start. A missed rolling retest means the driver did not provide a breath sample within the allowed response window. The device may request another test and record the event. Neither event should be treated as proof that the vehicle will shut off while moving.
What Happens at the MVD Level
MVD or another supervising agency reviews reported compliance information. Depending on the event, the driver's record, and the applicable Arizona rules, a report can lead to a program extension, a suspension-related action, or a hearing or reinstatement step. The device itself does not decide the final administrative outcome. Check your AZ MVD Now account and follow the notice or instructions from MVD, your court, or your supervising agency.
What Is the Difference Between a Missed and Failed Rolling Retest?
These terms describe different events:
- Missed rolling retest: You do not provide a breath sample within the permitted response window after the device requests one. Arizona MVD's stakeholder guidance distinguishes a missed retest from a sample that is provided and fails.
- Failed retest: You provide a breath sample, but the sample does not pass the device's alcohol testing requirement. This is different from simply not taking the test.
Neither event should be treated as proof that the vehicle will shut off while moving. A reported event may lead to additional MVD action under the applicable record and program rules, so do not guess about the consequence. Contact your provider for the device record and contact MVD or your supervising agency for the official program decision.
What Should Arizona Drivers Know Before Installation?
Arizona's Certified Ignition Interlock Device program has requirements beyond the handset in the vehicle. ADOT says drivers should use an authorized Arizona provider, complete installation and electronic reporting requirements, and follow the instructions for every vehicle they drive. Newly installed devices may include required camera, GPS, and real-time reporting capabilities.
Arizona says drivers have 30 days from the conviction date to install the device and have the manufacturer electronically report it to MVD. Failure to comply may result in immediate suspension. Installation and program timing also depend on the driver's case and MVD status, so before scheduling, confirm which agency issued your requirement, which vehicles must have a device, what reporting must reach MVD, and when your calibration or service appointments are due. See Arizona DOT Ignition Interlock Services page for current state instructions.
Arizona's public IID FAQ says the provider must send proof of calibration to MVD at least every 90 days. Ask your provider about the service schedule and keep every calibration and reporting appointment.
Can an Arizona Requirement Be Installed Outside Arizona?
An Arizona IID requirement may be serviced outside Arizona only through an Arizona-authorized interlock manufacturer and authorized service center that can complete the services and electronic reporting Arizona requires. ADOT says a driver who lives elsewhere should contact an Arizona-authorized provider to locate an authorized center in the other state.
For an Arizona-licensed driver, an installation at an unapproved out-of-state shop does not satisfy Arizona's IID requirement. If you move or live out of state, confirm the provider path and reporting process with the authorized provider and MVD before scheduling.
Who May Need an IID?
A court or motor vehicle agency may require an IID after certain alcohol-related driving offenses or as a condition of driving privileges. Requirements vary by jurisdiction and individual record. An IID provider can explain installation and service, but only the relevant court, MVD, or supervising agency can confirm the requirement and official status for your case.
Contact Budget IID for help with professional Arizona IID installation and compliance support.
Frequently Asked Questions About IIDs
Will an IID turn off a moving vehicle?
No. The device is designed to prevent a vehicle from starting after a prohibited result, not to shut off a moving vehicle. If a retest prompt appears, follow the device instructions and handle it safely.
How long does an Arizona IID requirement last?
The length depends on the driver's conviction, license status, and compliance record. Arizona guidance commonly describes a minimum period, but violations or other case requirements can change the timeline. Confirm the current end date with MVD or your supervising agency.
What should I do after a retest event?
Write down what happened, keep any device or compliance notice, and contact your provider if you believe the device recorded an error. Contact MVD or the supervising agency for the official program decision. Do not remove or bypass the device without authorization.
Get Help With Your Arizona IID
Budget IID provides professional installation and local compliance support for drivers in Arizona and select California areas. To discuss your situation and the next installation step, use the Budget IID contact form or visit the locations page to find nearby service options.