Ignition interlock devices prevent a vehicle from starting when your breath alcohol concentration exceeds a set threshold, require periodic retests while driving, and record events for program administrators and courts. You will interact with the device each time you drive, and the device records timestamps, BrAC readings, and any failed or missed tests.

Installation and Calibration

A certified technician installs the IID in your vehicle's ignition circuit, usually on the steering column or dash. The technician routes wiring to the starter relay so the vehicle will only start after an acceptable breath test. Installation typically takes 30–90 minutes, depending on vehicle complexity.

You must return to the provider for initial calibration and then at regular service intervals (commonly every 30–90 days). Calibration uses known alcohol standards to verify the fuel-cell sensor accuracy. The provider documents the calibration date, mileage, and software version; this record goes to the monitoring agency if required.

Removal requires proof of program completion or a court order. Tamper switches and backup batteries are installed to detect unauthorized removal. If the device detects tampering, it logs the event and may trigger a lockout or notify authorities per program rules.

Alcohol Detection Technology

Most modern IIDs use a fuel-cell sensor that generates an electrical current proportional to the alcohol amount in your breath. Fuel-cell sensors are more specific to ethanol than semiconductor sensors, so they reduce false positives from substances like mouthwash or certain foods.

The device measures breath alcohol concentration (BrAC) and compares it to the program’s threshold—often 0.02 g/dL but sometimes set differently by court or state. If your BrAC is at or above the threshold, the unit prevents engine start and logs the failed attempt.

Devices also require periodic "rolling retests" while the vehicle is running to ensure the original driver remains sober. The IID will warn you several seconds before a retest and give a short window to provide a sample; failure to comply triggers an event log and may activate escalating responses from the monitoring program.

Daily User Guidelines

Before starting the car, blow steadily into the mouthpiece for the prompted duration—usually 4–6 seconds—to produce a valid sample. If you fail the sample, wait the prescribed interval (commonly 15–60 seconds) and try again; multiple consecutive failures may register as violations.

Keep the mouthpiece clean and dry; follow the provider’s instructions for routine maintenance and mouthpiece replacement. Avoid alcohol, certain medications, and even dense food residues before driving to lower false-positive risk. If you use mouthwash or carry alcohol-based sanitizer, rinse with water and wait per provider guidance.

Respond promptly to service reminders and Rolling retest alerts while driving. If the device records violations, contact your provider immediately to understand required steps—service visits, recalibration, or reporting to the court—and preserve receipts for compliance records.

Enrollment and Completion Process

You will need to confirm eligibility, pick an ADOT‑approved provider, complete the required hours or ignition interlock steps, and ensure the Motor Vehicle Division (MVD) receives documentation. Deadlines and reporting method matter for keeping your license in good standing.

Eligibility Determination

First, check the order or notice you received from the MVD. That document states whether Traffic Survival School (TSS) or ignition interlock is required, the deadline (commonly 60 days for TSS), and any court or MVD conditions. If your notice lists a suspension or ignition interlock mandate, note start and end dates and whether eligibility depends on prior violations or alcohol test results.

Next, verify your personal eligibility. TSS typically applies for specific violations like aggressive driving or point thresholds; it does not remove points. Ignition interlock eligibility depends on an impaired‑driving conviction or administrative order. If you have questions, contact the MVD or the Arizona Chapter of the National Safety Council to confirm whether you must enroll and whether any exceptions apply.

Selection of Certified Providers

Choose a provider licensed by the Arizona MVD Motor Vehicle Division for Traffic Survival School. Use azstatetss.org or the MVD’s approved provider list to find certified schools that report same‑day completion. For ignition interlock, select an installer certified to meet state calibration and reporting requirements; common vendors include Lifesafer and other MVD‑approved companies.

Compare providers on price, schedule, and reporting speed. For TSS, look for an 8‑hour course option and confirm whether the class is in‑person or online and whether the school reports completion electronically. For ignition interlock, confirm installation fees, mobile service availability, and that the vendor will submit required monitoring data to the MVD. Keep receipts and enrollment confirmations as proof.

Completion Verification

After you finish TSS or install an ignition interlock, verify that the MVD received your completion certificate or device activation report. For TSS, many schools report same day; still check your MVD record online or call the MVD to confirm. If the record does not update, request a copy of the school’s electronic submission or a stamped completion certificate.

For ignition interlock, ensure the installer furnishes a completion/activation notice and that device calibration and monitoring are reported. Maintain logs of maintenance or removals, because MVD often requires documented proof before restoring full driving privileges. If any reporting issues arise, escalate to the provider and the MVD immediately to avoid unintended suspensions.