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Christoph Law Offices, DUI & Criminal Defense
Christoph Law Offices, DUI & Criminal Defense


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  • Former Deputy San Diego City Attorney
  • Former USMC Captain
  • Located Directly Across From Vista Courthouse
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Attorneys William R. Christoph & Nicholas W. Christoph

Ignition Interlock Devices in California

by | Jun 1, 2023

In an effort to enhance road safety and reduce the instances of drunk driving, California has implemented stringent measures to discourage individuals from driving under the influence (DUI). One such measure is the mandatory use of Ignition Interlock Devices (IIDs) for certain DUI offenders. These devices prevent intoxicated individuals from operating a vehicle, thereby mitigating the risks associated with impaired driving. This is an overview of Ignition Interlock Devices in California, their functionality, the laws governing their use, and their impact on road safety.

What is an Ignition Interlock Device?

An Ignition Interlock Device is a breathalyzer-like device that is installed in a vehicle to prevent it from starting if the driver’s breath alcohol concentration exceeds a predetermined limit. It works by analyzing the breath sample provided by the driver for the presence of alcohol. If the alcohol concentration exceeds the set limit, the device temporarily disables the ignition system, preventing the vehicle from starting.

California Laws and IID Requirements

California has implemented laws mandating the use of Ignition Interlock Devices for DUI offenders. The state’s IID program is governed by the Department of Motor Vehicles (DMV) and aims to prevent repeat offenses and protect public safety. The specific requirements for IID installation depend on the circumstances of the DUI offense:

  1. First-time DUI offense: Under California law, a first-time DUI offender allows for the voluntary installation of an IID. This option allows the offender to have their driving privileges reinstated more quickly, provided they comply with the program requirements.
  2. Multiple DUI offenses: For individuals convicted of multiple DUI offenses, the installation of an IID is mandatory. The duration of IID installation depends on the number of prior DUI convictions within a specific time frame.
  3. Administrative per se (APS) suspensions: In cases where a driver’s license is suspended due to an administrative per se suspension following a DUI arrest, the DMV may require the installation of an IID as a condition for license reinstatement.

Benefits of Ignition Interlock Devices

  1. Deterrence: The presence of an IID acts as a powerful deterrent, discouraging individuals from driving under the influence. Knowing that they will be unable to start their vehicle if intoxicated can dissuade potential offenders from making dangerous decisions.
  2. Rehabilitation: IIDs can also serve as a rehabilitative tool for DUI offenders. By requiring the individual to provide a breath sample every time they start their vehicle and periodically while driving, the device promotes accountability and responsibility.
  3. Public Safety: By preventing intoxicated individuals from operating a vehicle, IIDs contribute to overall road safety. They significantly reduce the risks of accidents, injuries, and fatalities associated with drunk driving.
  4. License Restoration: For individuals with a suspended or revoked license, complying with the IID requirements can be a pathway to license reinstatement. It offers an opportunity for offenders to demonstrate their commitment to safe and sober driving.

Ignition Interlock Devices are instrumental in California’s efforts to combat drunk driving and improve road safety. By mandating their use for certain DUI offenders, the state aims to deter individuals from driving under the influence while providing an opportunity for rehabilitation and license restoration. These devices serve as a vital tool in ensuring public safety by preventing intoxicated individuals from operating a vehicle. As California continues to prioritize the reduction of drunk driving incidents, Ignition Interlock Devices play a crucial role in creating a safer environment for all road users.




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