Enter Your Zip Code to Connect with a Lawyer Serving Your Area. In Illinois, you can get a DUI (driving under the influence, also known as drunk driving) if you drive with a blood alcohol concentration (BAC) of 0.08% or higher, regardless of whether your driving ability was actually impaired.n Illinois, the maximum blood alcohol content (BAC) for drivers who are under 21 (considered minors under some drinking and driving laws) is 0%.