New Laws Concerning DUI in Illinois.

Effective January 1, 2018

 Enhanced penalties apply upon conviction for driving while revoked if the driver
is revoked for aggravated DUI that resulted in a death. The prosecution of an
Aggravated DUI resulting in the death of another person may be commenced at
any time.

Effective August 11, 2017

The Secretary of State shall be notified when a person has been convicted of or
received a court supervision for operating a snowmobile or watercraft while
under the influence of alcohol, drugs or intoxicating compounds.

Driving Under the Influence (DUI).

“Driving Under the Influence” is defined as operating a motor vehicle while impaired by alcohol, other drugs, including cannabis (marijuana) prescribed for medical purposes, or intoxicating compounds and methamphetamine. In Illinois, drivers are legally considered to be under the influence if they have a blood-alcohol content (BAC) of .08 or more, a tetrahydrocannabinol (cannabis) concentration (THC) of either 5 nanograms or more per milliliter of whole blood or 10 nanograms or more per milliliter of other bodily substance, have used any other controlled substance or are impaired by medication.