In Illinois, DUI means Driving Under the Influence. For instance, under 625 ILCS 5/11-501, it is illegal to drive under the influence of alcohol. It is illegal to drive under the influence of any illegal drug, including marijuana.
Although it is legal to drive while using a prescription medication that can affect your mind, it is illegal to drive if the medication so alters your mind that you cannot think and act with ordinary care while operating a motor vehicle. It is also illegal to drive under the influence of any intoxicant (“huffing”).
Finally, it is illegal to drive if the percentage of alcohol in your bloodstream is .08 or higher, because there are scientific studies that suggest anybody with a blood alcohol ratio of at least .08 suffers from impaired driving. This is known as the “per se” law, meaning that the existence of that blood alcohol level, standing alone, is sufficient to prove a DUI and also to support a statutory summary suspension (SSS). Continue reading →