Ignition Interlock Devices

Ignition Interlock Devices

Ignition interlock devices, or IIDs, are installed in a means when a motorist has been convicted of a DUI related offense. This device resembles the breathalyzer that law enforcement officials administer if they speculate a driver of intoxication. The purpose of an IID is to ensure that motorists are not driving while intoxicated.

How IIDs Function

Upon entering a car, IIDs require a driver to exhale into a tube that checks for alcohol content. The ignition will not start the engine if the driver a) does not provide a sample of his/her breath, or b) if the sample provided contains a level of alcohol that exceeds the allowable amount programmed into the IID (typically.02 or.04).

Once the driver passes the initial test and the means turns on, the IID requires random breath samples while en route. This characterize discourages intoxicated drivers from having a friend blow into the IID, enabling them to excursion away while drunk. If a driver fails to provide an permissible breath sample, the IID records the example and activates an alarm system that involves the horn and lights, consequently, encouraging the driver to pull over.

Once the car is turned on, the IID cannot turn it off because of a bad sample-instinctive stall outs are a danger to motorists, and could make the manufacturer liable for a number of possible accidents.

At 30, 60, or 90 day intervals, the device is calibrated and results are downloaded and printed for review by a probation officer. IIDs record every example when a driver blows into the device, whether they pass or fail.

Spread of IIDs

Since their creation, ignition interlock programs have become a popular sentencing for persons convicted of a DUI related offense. All 50 states allow the installation of IIDs, and they are beginning to spread internationally, in addition. Countries like Japan, Canada, and Sweden are investigated its effectiveness, and are considering adopting a program similar to the US’s for rehabilitating repeat drunk drivers.


While there is not much argue about their effectiveness, there are some critics of IIDs who argue that installing IIDs is a violation of privacy. Additionally, they claim that they are not as effective for rehabilitating one-time offenders with a high BAC. There has only been on case in which a driver claimed that an IID caused him to pass out while blowing, resulting in an accident.

For more information on ignition interlock devices and DUI related offenses, contact the Rhode Island drunk driving lawyer James Powderly.

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