A failed field sobriety test is not a guaranteed DUI conviction. These roadside exercises are far from foolproof, and courts recognize that. Officers are trained to look for specific signs of impairment, but what they observe can be influenced by factors that have nothing to do with alcohol or drugs. The results are not scientific measurements. They are one officer’s interpretation of how you performed under pressure, and that interpretation can be challenged. If you are facing a DUI charge after failing field sobriety tests in 2026, a Chicago DUI defense lawyer can take a hard look at what actually happened during your stop and start building a defense based on the real facts of your case.
How Is a Field Sobriety Test Used in Illinois DUI Cases?
When a police officer suspects a driver may be impaired, they often ask that driver to perform a series of roadside exercises before making an arrest. The first tracks involuntary eye movement as the driver follows a moving object with their eyes. The second asks the driver to walk heel to toe in a straight line, turn around, and walk back. The third requires the driver to lift one foot off the ground and hold it there for a set period of time without losing balance. Officers use the results of these tests to justify making a DUI arrest.