Chicago Criminal Lawyer Blog
If you were arrested for DUI in Chicago, your future could hinge on evidence collected in a matter of minutes. In Illinois, prosecutors don’t rely on one smoking gun. They use layers of evidence — police reports, chemical test results, bodycam footage, and field observations — to build a case that looks stronger than it may actually be. Understanding this process is the first step toward building your defense.
Under Illinois law (625 ILCS 5/11-501), it is a criminal offense to drive or be in actual physical control of a vehicle while under the influence of alcohol, drugs, or any combination of intoxicating substances. First offenses are misdemeanors, but enhanced circumstances can lead to felony charges. For instance, a DUI with a suspended license or one that causes serious injury can become a Class 4 or Class 2 felony.
Most DUI investigations start with a traffic stop. The officer must have a legally valid reason — like failure to maintain lane position or speeding. What happens next is crucial. Officers immediately begin collecting visual and verbal evidence. They observe if your speech is slurred, your eyes are red or watery, or if there’s an odor of alcohol.
