Typically, Illinois DUI law prohibits drivers from operating a motor vehicle if they have a blood alcohol content (BAC) of 0.08% or higher. This is the legal limit, and drivers who have a higher BAC are presumptively considered to be driving under the influence of alcohol.
However, individuals who have a CDL face a lower legal limit in the state of Illinois. Instead of being deemed under the influence with a BAC at or above 0.08%, CDL holders who are driving their commercial vehicles are considered inebriated if their BAC is 0.04% or above.
