NEW ORLEANS DWI DEFENSE ATTORNEY   Elizabeth Bagert Carpenter, Esq.  --  Defending DWI Cases In South Louisiana   IGNITION INTERLOCK DEVICE -- INSTALLATION AND CERTIFICATION -- La. R.S. 15:307   As used in R.S. 15:306, "ignition interlock device" means a constant monitoring device that prevents a motor vehicle from being started at any time without first determining the equivalent blood alcohol level of the operator through the taking of a breath sample for testing.  The system shall be calibrated so that the motor vehicle may not be started if the blood alcohol level of the operator, as measured by the [...]