If you are convicted of driving under the influence of alcohol in Alameda, Los Angeles, Sacramento, and Tulare County, California, state law requires you to install an ignition interlock device on your automobile and pay all services fees associated with said device. This law has been effect since 2010 and will remain in effect until 2015.

An ignition interlock device requires the driver to self-administer and pass a breathalyzer test attached to the ignition system of the vehicle. If the driver does not pass the test, or fails to administer the test, the vehicle will not start. It is illegal for any driver convicted of DUI and required to install an ignition interlock device to drive any vehicle without one, and it is illegal for anyone to tamper with an interlock ignition device in any way.

Fees and fines assessed for conviction of driving under the influence of alcohol in California and installation of the required interlock ignition device can run into the thousands of dollars for the first offense alone.

New legislation (AB 91) requires the Department of Motor Vehicles (DMV) to implement a pilot program July 1, 2010, through December 31, 2015, that requires individuals convicted for first and repeat driving under the influence (DUI) offenses in Alameda, Los Angeles, Sacramento, and Tulare County to install a certified ignition interlock device (IID) on all vehicles they own or operate.