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Breath Lock Device for Cars: How Ignition Interlock Works in Georgia
What Is a Breath Lock Device?
A breath lock device – formally called an ignition interlock device (IID) – is a small breathalyzer wired into a vehicle's ignition system. It stops the engine from starting if the breath sample shows alcohol above the limit Georgia law sets. Courts and the Georgia Department of Driver Services (DDS) order these devices for drivers convicted of DUI. You may also hear them called a "car breathalyzer," an "auto breathalyzer interlock," or a "blow-and-go." The device sits on or near the dashboard. It connects to the vehicle's starter circuit. Before the car will start, the driver must blow a deep lung breath sample into a mouthpiece. The device will not accept a sample that is not human breath. Georgia uses these devices to keep impaired drivers off the road. The device still allows drivers to travel for work, school, and other essential needs.
Auto Breathalyzer Interlock: How the Automated System Works in Your Vehicle
An auto breathalyzer interlock is a court- or DDS-ordered unit. It prevents a vehicle from starting when alcohol is detected on the driver's breath. The term "auto" highlights the device's automatic features.
The device automatically locks the ignition when breath alcohol is above 0.02 grams. It automatically prompts rolling retests at random times while the vehicle is running. Every test result, failed attempt, and power loss is logged in the device's memory with a date and time stamp.
At each calibration appointment, the state-certified provider downloads this data. The provider reports it to the Georgia Department of Driver Services. Georgia law defines the ignition interlock program and requires every device to be certified by the Department of Driver Services.
A typical Georgia vehicle has several integrated components. The handheld unit mounts near the dashboard. A fuel cell sensor measures breath alcohol. A control module wires into the ignition harness. Many devices also include a camera to photograph the person providing each sample. Some have a cellular or GPS reporting module that sends data to the provider between calibration visits.
Georgia law uses a single term for this equipment – ignition interlock device. In everyday use you may hear it called an auto breathalyzer interlock, a breathalyzer interlock system, or a breath lock device. All these terms refer to the same equipment required for certain DUI offenders under Georgia law.
How Does a Breath Lock Device Work?
The process starts when the driver picks up the handset and blows into the mouthpiece. A fuel cell sensor inside the device measures breath alcohol concentration (BAC). If the reading is 0.02 grams or lower – the limit Georgia law sets for these devices – the ignition unlocks. The vehicle starts normally. If the reading is above that limit, the device locks the ignition and records the failed attempt.
Once the vehicle is running, the device requires rolling retests. These are random breath samples the driver must provide while driving, at intervals the certified device sets. The device alerts the driver with a tone when a retest is due. The driver then has a few minutes to pull over safely and provide a sample.
If the driver fails a rolling retest, the device does not shut off the engine. Cutting the engine at highway speed would create a serious safety hazard. Instead, the device logs the failed test. It may trigger the vehicle's horn and lights to flash until the driver turns off the car. The event is recorded and reported to DDS at the next calibration appointment.
Many newer models include a small camera. This camera photographs the person blowing into the mouthpiece. It prevents someone else from providing the breath sample for the driver. This is a common form of circumvention. The camera effectively eliminates this risk.
Who Is Required to Install a Breath Lock Device in Georgia?
Georgia law sets out specific situations where a court or DDS will require an ignition interlock device. An IID is generally required for:
- Second or subsequent DUI convictions within five years. Where the court grants probation for a second conviction, it issues a certificate of eligibility conditioned on keeping a certified interlock device for at least one year.
- Drivers seeking an early limited permit. After a DUI suspension, drivers who want an interlock-restricted permit must install a certified device within ten days of the permit being issued.
- Some first-offense DUI cases. A first-offense DUI driver who seeks a limited driving permit may face an interlock requirement depending on the circumstances.
The Georgia Department of Driver Services issues the interlock-restricted license. Drivers must apply through DDS and show proof of installation from a state-approved provider. Drivers must also finish a certified DUI Alcohol or Drug Use Risk Reduction Program.
Requirements differ for underage drivers and commercial license holders. DDS cannot issue an interlock-restricted permit to anyone under 21, and under-21 drivers face a stricter 0.02 breath-alcohol limit. DDS also cannot issue one to a driver who currently holds a commercial license. A device on a personal car does not restore commercial driving rights.
Many drivers do not know that after a second DUI conviction they can apply for an interlock permit once they have served at least 120 days of the suspension. We have helped second-offense clients obtain interlock permits. This allowed them to keep driving to work while their case moved through court.
How Long Do You Have to Keep a Breath Lock Device Installed?
The required interlock period depends on the number of DUI offenses and the terms of the court order or DDS restriction. For a second DUI conviction the device must stay installed for at least one year. A first offender who takes the state breath test and gets an interlock permit keeps the device for at least four months, and for at least 12 months after a test refusal. A third or subsequent conviction within five years makes a driver a habitual violator, and that revocation runs for years before any interlock probationary license can be issued.
An important detail many drivers overlook: the clock only runs during compliant use. If the provider reports a missed monitoring visit, an unsatisfactory report, or a request to take the device off early, DDS must revoke the permit immediately. Violations include failed breath tests, missed rolling retests, missed monitoring appointments, or evidence of tampering. After a revocation DDS can issue a fresh one-year interlock permit, so the clock starts over rather than simply running longer.
Removing the device takes DDS action, not a decision by the driver or the provider. DDS cancels the interlock restriction once the driver completes the full term of monitoring and pays a $100 fee, or $90 when the fee is processed by mail. Asking the provider to take the device off any sooner is reported to DDS and costs the driver the permit. Only after the restriction is cancelled can the driver apply for a full, unrestricted license.
How Much Does a Breath Lock Device Cost?
The driver pays all costs for the interlock device. Georgia does not cover these expenses. Typical costs break down as follows:
| Cost Component | Typical Range |
|---|---|
| Installation fee | $75 – $150 |
| Monthly monitoring and calibration | $70 – $100 per month |
| Removal fee | $50 – $100 |
| Estimated annual total | $1,000 – $1,500 |
Monthly calibration appointments are mandatory. During these visits, the provider downloads data from the device and checks for tampering. The provider recalibrates the sensor and reports results to DDS. Missing a calibration appointment counts as a violation.
Provider fees have to be approved by the Department of Driver Services, and a court can make paying them a condition of probation. Where a county or city leases devices from a private company, it must let drivers the court finds indigent and unable to pay take part in the interlock program. A court can also exempt a driver from the device for undue financial hardship, but that exemption costs all driving privileges for one year.
Installation and Daily Use: What to Expect
Installation takes about two to three hours at a state-certified interlock provider. A technician wires the device into the vehicle's ignition system. The technician mounts a handheld unit on or near the dashboard and trains the driver on how to use the device. Training covers proper blowing technique and how to handle rolling retests.
Daily use follows a consistent routine. Before starting the car, the driver picks up the handset and blows steadily into the mouthpiece for a few seconds. Then the driver waits for the result. A passing test unlocks the ignition. While driving, the device signals when a rolling retest is due, on the schedule programmed into the certified unit. The driver should pull over when safe to provide the sample.
Georgia law requires drivers to report to the provider center every 30 days for monitoring. These appointments usually take 20 to 30 minutes.
A typical breathalyzer interlock system installed in a Georgia vehicle consists of several connected components. The handheld unit near the dashboard houses the mouthpiece and display. Inside that unit, a fuel cell sensor measures breath alcohol with high precision. A control module wired into the ignition harness communicates with the vehicle's starter circuit to lock or unlock the engine. Where DDS requires it – often for repeat offenders – a small camera attaches to the handset to photograph each breath sample. Many state-certified providers also use a cellular or GPS reporting module that sends test data between calibration visits.
Common false positive triggers catch many drivers off guard. Mouthwash containing alcohol, certain breath mints, hand sanitizer fumes, sourdough bread, and very ripe fruit can produce a trace alcohol reading. Drivers should rinse their mouth with water and wait two to three minutes before blowing. The device typically allows a short window to retest if the first attempt fails.
Consequences of Tampering With or Circumventing a Breath Lock Device
Tampering with, disconnecting, or having someone else blow into an ignition interlock device is a criminal offense in Georgia. Circumventing the device carries serious consequences under Georgia law:
- Immediate permit revocation. On notice that a device was tampered with, DDS must revoke the interlock-restricted permit, leaving the driver with no legal way to drive.
- A long wait to reapply. After a first revocation the driver cannot apply for a license for six months, and after an earlier revocation the wait is two years.
- A separate misdemeanor charge. Tampering with or circumventing the device is its own misdemeanor offense on top of the original DUI penalties, and the warning label on every device says so.
Modern devices make cheating very hard to hide. Every breath test, failed attempt, missed retest, and power cut is logged with a date and time stamp. Models with cameras photograph the person giving each sample. Providers download this data at every visit and report it to DDS.
Some clients faced extra months on the device over a simple mistake. A brief power cut is logged and can be read as a possible tampering event. For example, swapping the car battery without telling the provider can show up in the data that way. Following the provider's instructions carefully is essential to completing the interlock period on time.
Speak With a Georgia DUI Defense Attorney About Interlock Requirements
An auto breathalyzer interlock order affects your daily routine, your budget, and your ability to get to work. The requirements can feel overwhelming, but a Georgia DUI defense attorney may be able to help.
Depending on the circumstances of your case, a defense lawyer can challenge the traffic stop. An attorney can also challenge the breath test results that led to the interlock requirement. An attorney can negotiate permit terms with DDS. Your lawyer can advise you on applying for an interlock-restricted permit. Your attorney can work to protect your driving privileges. In some cases, it may be possible to avoid the device requirement altogether.
If you are facing a DUI charge or an interlock order in Georgia, contact Georgia Criminal Defense for a free consultation. Every case is different, and results depend on the specific facts. An experienced attorney can review your situation and explain your options.
Frequently Asked Questions
How Much Does a Breath Lock Device Cost in Georgia?
Most drivers pay between $1,000 and $1,500 per year for an ignition interlock device. This includes installation ($75 – $150), monthly monitoring and calibration ($70 – $100 per month), and removal ($50 – $100). Provider fees must be approved by DDS, and a county or city that leases devices from a private company must let drivers the court finds indigent take part in the program.
How Long Do I Have to Keep an Ignition Interlock Device in My Car After a DUI in Georgia?
The minimum period is one year for a second DUI conviction, and four months for a first offender who takes the state breath test. A third conviction within five years makes a driver a habitual violator, so the revocation runs for years before any interlock license can be issued. Violations such as failed tests or missed monitoring visits can cost the permit outright. The device stays installed until DDS cancels the restriction after the full term of monitoring and a $100 fee.
Can I Drive Someone Else's Car if I Have a Breath Lock Device Requirement?
No. Your restricted license lets you drive only a car fitted with an approved IID. Driving any car without the device while restricted breaks your permit terms. That can cost you the permit and bring a separate misdemeanor charge. Georgia law also makes it a misdemeanor to lend a car without a device to a restricted driver, and the restricted driver must tell anyone who lends or rents them a car about the restriction.
What Happens if I Fail a Breath Test on My Ignition Interlock Device?
If you fail a pre-start test, the device locks the ignition and the car will not start. You must wait a few minutes before retesting. If you fail a rolling retest while driving, the device logs the event. It may trigger the horn and lights. The engine will not shut off. All failures are reported to DDS at your next calibration.
Can Mouthwash or Food Trigger a False Positive on a Breath Lock Device?
Yes. Mouthwash containing alcohol, certain breath mints, hand sanitizer fumes, sourdough bread, and very ripe fruit can produce trace alcohol readings. Drivers should rinse their mouth with water and wait two to three minutes before providing a breath sample. This reduces the risk of a false positive.
Is an Auto Breathalyzer Interlock the Same as an Ignition Interlock Device?
Yes. An auto breathalyzer interlock, a breathalyzer interlock system, and an ignition interlock device (IID) are all different names for the same equipment. Georgia law requires these devices for certain DUI offenders as a condition of probation or of an interlock-restricted permit. The word "auto" highlights three key automated features. First, the device automatically locks the ignition when breath alcohol is above 0.02 grams. Second, it automatically prompts rolling retests during driving. Third, it automatically reports data to DDS. Only state-certified providers may install an approved device in Georgia.