Ignition interlock devices are becoming more and more common in drunk driving cases. An ignition interlock device is a breath-testing machine that attach to a vehicle’s steering column. The equipment prevents the car from starting unless the driver provides a breath sample that is within preset limits – usually no alcohol at all. A skilled DUI / DWI defense attorney from www.NotDrunk.com can advise whether the device is likely to be ordered in a particular case.

Judges can order the installation of an ignition interlock device even in a first-time drunk driving case.  The installation of an ignition interlock device is most likely to be ordered in cases where the driver refused to take a chemical test to determine blood alcohol content (BAC), or had a BAC above a certain limit.

Drivers who have prior DUI / DWI convictions, or who were arrested while driving on a suspended license from a prior conviction also may be required to install an ignition interlock device on their vehicles.

Ignition interlock technology is based on a simple principle – the vehicle will not run if the driver’s breath sample exceeds a certain BAC limit. Once the vehicle is in motion, the driver must provide another breath sample every 15 minutes to one hour in what is known as a “rolling re-test.” If the rolling re-test isn’t performed, a violation will be recorded.