For a DUI in Illinois, a driver is legally considered to be under the influence if he/she has a
blood-alcohol concentration (BAC) of .08 or more, has used any illegal substance, or is impaired by
medication. A driver’s BAC is based on the ratio of alcohol to blood or breath. However, an
individual with a BAC between .05 and .08 may be convicted of a DUI in Illinois if additional
evidence determines that the driver w...
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