Turns out, starting tomorrow, that Illinois Has One Of The Nation's Toughest DUI Laws. With just your first DUI conviction, you will have to prove you are sober to even start your car by blowing into a device like the one here.
If convicted of a DUI, you will have 14 days to get a breath-alcohol ignition-interlock device installed in your vehicle's dash. Then, if the driver "blows" a blood-alcohol content above 0.024, the engine won't start. Individuals with multiple DUI convictions previously could be ordered to install the device.
So have a Happy New Year, and as always, dont drink & drive ;)