An Ignition Interlock Device, also known as an "IID" is a small breathalyzer device, not much bigger than a cellphone that is wired to the ignition of a vehicle. If a court orders a DUI offender to install an IID, the offender's vehicle will not start until they have provided an alcohol-free breath sample.

One of the features of the IID is what's called the "running retest," which requires a breath sample from the driver periodically as he or she drives.

If the driver fails the retest, the vehicle will not shut down as this would be dangerous. Instead, the vehicle's lights will flash and the horn will honk in order to notify any nearby law enforcement officers.

Each state handles DUIs and DWIs differently. Some states require that all people convicted of driving under the influence install an IID, whereas others require that the device be installed upon a second offense.

Whether a court orders an IID for a first or subsequent DUI offense, IIDs are required to meet standards established by the National Highway Traffic Safety Administration (NHTSA), and they must be installed by an approved provider. Offenders are responsible for paying for the installation of IIDs and for regular maintenance costs.

Generally, IIDs can cost up to $150 to install and about $60 to $80 per month thereafter. If an offender cannot afford the cost of installation and maintenance, there are generally programs available that help cover the costs of the IID installation, calibration and maintenance.

Are there ways to 'trick' the device?

Offenders often ask, "Is there a way to trick the device? Can my friend blow into the device instead of me?" Yes, this is possible, however, there are strict penalties for allowing someone else to blow into the device.

Both the DUI offender and the other person who blows into the IID device would face repercussions. So, it's much safer not to drink and drive.

Arrested for DUI or DWI? Contact a DUI defense attorney to fight your charges!