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Ignition Interlock Device (IID)

Learn about Ignition Interlock Devices (IIDs) in South Carolina, how they work, their role in DUI cases, and why courts mandate their use. Thompson and Hiller Defense Firm provides comprehensive legal support for DUI charges and IID requirements.

What is an Ignition Interlock Device?

An Ignition Interlock Device (IID) is a breathalyzer installed in a vehicle that prevents the engine from starting if alcohol is detected on the driver’s breath. This device is designed to reduce repeat offenses of driving under the influence (DUI) by ensuring that the driver remains sober before and during the operation of their vehicle. The IID requires the driver to blow into a mouthpiece, and if the detected blood alcohol concentration (BAC) is above a pre-set limit, the vehicle will not start.

How Does an Ignition Interlock Device Work?

An IID works through a series of steps:

  1. Initial Test: Before starting the vehicle, the driver must blow into the IID’s mouthpiece.
  2. Breath Sample Analysis: The device measures the alcohol level in the breath sample. If the BAC is below the pre-set limit, the vehicle will start. If it is above the limit, the engine will not start.
  3. Rolling Retests: While driving, the device may require random breath samples to ensure continuous sobriety. The driver will be prompted to blow into the device at various intervals.
  4. Data Recording: The IID records all breath samples, both passing and failing, along with any attempts to tamper with the device. This data is periodically sent to the appropriate monitoring authority.

Why Courts Mandate Ignition Interlock Devices

Courts in South Carolina may mandate the installation of an IID as a condition for regaining driving privileges after a DUI conviction, especially for repeat offenders or cases involving high BAC levels. The reasons for this mandate include:

  • Enhancing Public Safety: IIDs prevent intoxicated individuals from operating a vehicle, thereby reducing the risk of DUI-related accidents and fatalities.
  • Deterring Repeat Offenses: The requirement of an IID can deter individuals from driving under the influence again, as it adds a layer of accountability and monitoring.
  • Compliance with DUI Penalties: The IID serves as part of the penalty and rehabilitation process for DUI offenders, helping them reintegrate into society while ensuring they adhere to sober driving practices.

Ignition Interlock Device Requirements in South Carolina

In South Carolina, the use of IIDs is governed by specific laws and regulations:

  • Mandatory for Repeat Offenders: For those with multiple DUI convictions, the installation of an IID is mandatory.
  • High BAC Levels: First-time offenders with a BAC of 0.15% or higher may also be required to install an IID.
  • Duration: The duration for which an IID must be installed varies based on the number of offenses and BAC levels. It can range from several months to several years.
  • Costs: Offenders are typically responsible for the costs associated with the IID, including installation, maintenance, and monitoring fees.

Additional Details About Ignition Interlock Devices

  • Calibration and Maintenance: IIDs require regular calibration and maintenance to ensure accurate readings. This service is typically performed by certified IID service providers.
  • Tampering Penalties: Attempting to tamper with or circumvent the IID can result in additional penalties, including extended use of the device, fines, and potential jail time.
  • Compliance Reporting: Data from the IID is sent to the monitoring authority, which could be the DMV, probation officer, or court. Non-compliance can lead to further legal consequences.

Thompson and Hiller Defense Firm: Your Advocates in DUI Cases

At Thompson and Hiller Defense Firm, we understand the complexities and challenges associated with DUI charges and the subsequent requirements, such as the installation of an Ignition Interlock Device. Our experienced attorneys are dedicated to providing you with comprehensive legal support, helping you navigate the legal process, and advocating for your rights. If you are facing a DUI charge and have questions about IIDs or any other aspect of your case, contact us today for a free consultation.

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