
Alcohol ignition interlock devices are in-car alcohol breath screening devices that prevent a vehicle from starting if they detect alcohol in the driver's system. These devices are mandatory for individuals with alcohol-related driving offenses who wish to continue driving after their license is reinstated. While the installation of these devices is typically the responsibility of the individual, companies that provide company vehicles may choose to install them to allow employees with alcohol interlock device restrictions to use them.
| Characteristics | Values |
|---|---|
| Purpose | To prevent individuals under the influence of alcohol from operating a vehicle |
| Function | Measures breath alcohol content (BAC) level |
| Installation | Must be installed in any vehicle the driver operates |
| Licence | Allows individuals with a suspended or revoked licence due to drug or alcohol-related offences to drive |
| Removal | Requires a certificate of removal from the department's interlock coordinator |
| Effectiveness | Leads to a 40–95% reduction in repeat drunk driving offences |
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What You'll Learn
- Alcohol ignition interlock devices prevent vehicles from starting if the driver is intoxicated
- They are mandatory for DUI offenders in some states, like Pennsylvania and Ontario
- They can reduce drunk driving recidivism by 40-95% when combined with monitoring programs
- Some states, like Washington, offer Ignition Interlock Licenses for driving with an IID while suspended
- You must install an IID in all vehicles you drive and obtain a Certificate of Installation

Alcohol ignition interlock devices prevent vehicles from starting if the driver is intoxicated
Alcohol ignition interlock devices are designed to prevent vehicles from starting if the driver is intoxicated. The device requires the driver to blow into a mouthpiece to provide a breath sample before the vehicle can be started. If the driver's breath-alcohol concentration (BAC) exceeds the preset limit, the engine will not start. This limit varies by country but is typically set between 0.02 and 0.025 BAC.
These devices are often mandated for individuals convicted of drunk driving, especially repeat offenders, as a condition of probation or license reinstatement. In some cases, installation may be required by law for first-time offenders as well. For example, in Washington State, an Ignition Interlock Driver License (IIL) allows individuals with a suspended or revoked license due to alcohol-related offenses to continue driving with an IID installed. Similarly, in Ontario, individuals must have an IID installed to maintain their driving privileges after a license reinstatement.
Commercial and public organizations may also voluntarily adopt the use of IIDs in their vehicle fleets to reduce the risk of monetary and reputational damages caused by accidents involving drunk driving employees. The International Council on Alcohol, Drugs, and Traffic Safety reports that the use of IIDs, when combined with comprehensive monitoring, can lead to a 40-95% reduction in repeat drunk driving offenses.
In addition to the initial breath test, IIDs perform random rolling retests while the vehicle is in motion to prevent someone other than the driver from providing an initial breath sample. If a driver fails or misses a rolling retest, the device logs a violation, but the car will not shut off to avoid creating an unsafe driving situation. Instead, it may trigger alarms, such as honking or flashing lights, to alert the driver.
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They are mandatory for DUI offenders in some states, like Pennsylvania and Ontario
Ignition interlock devices (IIDs) are mandatory for DUI offenders in some states and provinces, including Pennsylvania and Ontario. These devices are installed in vehicles and act as in-car alcohol breath screening devices, preventing the engine from starting if alcohol is detected in the driver's system. In Pennsylvania, DUI laws have been updated to include a tiered approach to enforcement and treatment, with penalties determined by an individual's blood alcohol content (BAC) level and prior offenses. First-time DUI offenders may be eligible for an Occupational Limited License (OLL) after serving a portion of their suspension, typically 60 days. Additionally, they may be required to install an ignition interlock device on all their vehicles before driving privileges are restored.
In Ontario, individuals convicted of alcohol-impaired driving may be able to reduce their licence suspension by having an ignition interlock device installed in their vehicle. This device requires the driver to blow into it before the vehicle will start, and it will prevent the engine from starting if the BAC exceeds the preset limit. Similarly, in Washington state, an Ignition Interlock Driver License (IIL) allows individuals with a suspended or revoked license due to drug or alcohol-related offenses to continue driving as long as their vehicles are equipped with an IID.
The use of IIDs has been shown to significantly reduce the rate of repeat drunk driving offenses. The International Council on Alcohol, Drugs, and Traffic Safety reports that IIDs, combined with comprehensive monitoring and service programs, lead to a 40-95% reduction in repeat offenses as long as the device remains on the vehicle. This technology ensures that individuals with a history of DUI offenses can safely continue driving while undergoing treatment and rehabilitation.
While the consequences of a first-offense DUI vary by state, common penalties include jail time, community service, fines, license suspension, and the installation of an IID. Some states may not require an IID for a first offense, but it is often mandated for obtaining a restricted license during the suspension period. Judges may also recommend alternative sentencing options such as substance abuse education, treatment programs, and community service, particularly for first-time offenders. The specific laws and requirements regarding DUI offenses and the use of IIDs differ across states and provinces, so it is essential to refer to local regulations.
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They can reduce drunk driving recidivism by 40-95% when combined with monitoring programs
Alcohol ignition interlock devices (IID) are instruments that you blow into before you can start your vehicle. They measure your breath alcohol content (BAC) level and can prevent the engine from starting if they detect alcohol in your system. If the BAC is over the preset limit, the vehicle won't start. If the driver is under the limit, the vehicle will start, but they will be asked to provide breath samples at random times while driving. If the driver doesn't provide a sample or their BAC exceeds the limit, the device will activate specific alarm systems, such as flashing lights and honking horns, until the ignition is turned off.
These devices are often used for drivers who have had their licenses suspended or revoked due to alcohol-related offenses. By participating in an IID program, drivers can continue to drive while their license is suspended, as long as they are driving a vehicle equipped with an IID. This allows them to maintain their independence and avoid the inconvenience of a fully suspended license.
When combined with comprehensive monitoring and service programs, IIDs have been shown to lead to a 40-95% reduction in the rate of repeat drunk driving offenses among offenders. This significant decrease in recidivism highlights the effectiveness of these devices in preventing drunk driving. The monitoring programs often include surveys and evaluations to ensure compliance with the IID program and identify any violations. Additionally, the combination of license actions, such as restrictions and suspensions, with rehabilitation and treatment programs, has been found to be more effective in preventing alcohol-related traffic incidents than solely relying on full license suspensions.
Various states have implemented different initiatives to reduce drunk driving and its associated harms. For example, Washington and Oregon have enacted legislation that allows police to seize the vehicle registration of drivers caught driving with a suspended license, providing a stronger deterrent. Additionally, legislative initiatives such as the minimum legal drinking age of 21, administrative license revocation, and lower legal BAC limits have contributed to a significant decrease in alcohol-related traffic fatalities. Well-funded media campaigns, increased legal enforcement, and community mobilization efforts have also been associated with a decline in alcohol-related crashes and fatalities.
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Some states, like Washington, offer Ignition Interlock Licenses for driving with an IID while suspended
An Ignition Interlock Device (IID) is a breath alcohol ignition interlock device that is installed in a motor vehicle to prevent the driver from operating the vehicle while intoxicated. The driver is required to blow into the mouthpiece to provide breath samples. If the driver's blood alcohol concentration (BAC) is over the preset limit, the vehicle won't start.
Some states, like Washington, offer Ignition Interlock Licenses (IIL) for driving with an IID while suspended. An IIL allows individuals to drive a vehicle while their license is suspended or revoked due to drug or alcohol-related offenses. To be eligible for an IIL, individuals must have a valid Washington driver's license or out-of-state driver's license. They must also maintain an ignition interlock device on all vehicles they drive, including employer-owned vehicles during work hours, unless an exemption is granted. Financial assistance may be available for those who cannot afford the costs associated with the IID.
The IID installer will provide a Verification of Installation Ignition Interlock form, which must be submitted to the relevant authority, such as the Department of Licensing or DMV, along with any applicable fees. Individuals may also need to provide proof of financial responsibility, such as a Certificate of Insurance. It's important to note that attempting to bypass or tamper with the IID is illegal and can result in criminal charges and extended license suspension.
The IID requirement period is typically the duration of an individual's suspension, and they earn day-for-day credit towards this requirement when the device is installed. If the IID is removed before the requirement period ends, the individual's license will be suspended.
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You must install an IID in all vehicles you drive and obtain a Certificate of Installation
If you are required to install an alcohol ignition interlock device (IID) in your vehicles, you must install an IID in all vehicles you drive and obtain a Certificate of Installation. This is a requirement for regaining your driving privileges after a DUI conviction.
An IID is a breathalyser instrument wired to your vehicle's ignition that you blow into before you can start your vehicle. It measures your breath alcohol content (BAC) level and prevents the engine from starting if it detects alcohol in your system. If your BAC is over the preset limit, the vehicle won't start. If you are under the limit, the vehicle will start, but you will be asked to provide breath samples at random times while the vehicle is running.
IID installers are required to have a valid license issued by the Bureau of Automotive Repair (BAR) or Bureau of Household Goods and Services (BHGS), which are part of the Department of Consumer Affairs (DCA). After installation, the installer will provide you with a Verification of Installation Ignition Interlock form (DL 920). You must then bring this form, along with any applicable fees, in person to the nearest DMV office to obtain an IID-restricted driver's license.
It is important to note that you must keep the IID installed for your entire requirement period. If you remove the IID before your restriction period is over, your driving privileges may be suspended or revoked. Additionally, the IID must be calibrated and inspected by a certified installer at intervals not to exceed 60 days to ensure it is functioning properly and that no violations have been logged.
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Frequently asked questions
An alcohol ignition interlock device is a system that connects a breath analyzer to a motor vehicle's ignition system. The device measures the concentration of alcohol in the breath of any person who attempts to start the motor vehicle. If alcohol is detected, the vehicle won't start.
It depends. If you have employees who have had their licenses suspended or revoked for a drug or alcohol-related offense and they need to drive for work, you may need to install alcohol ignition interlock devices in the vehicles they use. However, if the employee operates an employer-owned vehicle during work hours, you may submit an Employer Declaration for Ignition Interlock Exemption so you don't have to install the devices.
If an employee has an alcohol interlock device restriction on their license, they will only be able to drive company vehicles that are equipped with an approved alcohol ignition interlock device. If they drive a company vehicle without the device, they may be subject to fines and imprisonment.
Yes, financial assistance may be available to help with the cost of installing, leasing, removing, or transferring alcohol ignition interlock devices. You can apply for assistance by submitting an Ignition Interlock Device Financial Assistance Application.








































