When a driver in Illinois has an encounter with law enforcement while the driver is in actual physical control of a motor vehicle as required by Illinois DUI (Driving Under the influence) law (625 ILCS 5/11-501), the officer may be looking for signs of DUI impairment. This can begin with the initial driving behavior. Common markers of alcohol-related driving behavior include driving too slowly, wide turns and weaving.
This will provide the reasonable suspicion the officer needs to stop the driver. Terry v. Ohio 392 US 1, 20 L.Ed. 2d 889 (1968) The police will also observe the manner in which the driver executes the stop. This includes matters such as how quickly the driver notices the flashing lights and slows, how the driver performs while engaged in pulling over (using turn signal for instance) and how effectively the driver stops and parks the vehicle.
Next, the officer will have an opportunity to observe the driver face-to-face. Signs of impairment would be slurred, thick tongued speech, bloodshot and glassy eyes, heavy eyelids and an odor of alcohol. An officer will also note any difficulty the driver encounters in retrieving the driver’s license, insurance card and registration.
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