Most residents of Illinois are aware that the legal limit for drivers over the age of 21 is a blood-alcohol level of .08. However, most people are less aware of the two other legal limits. First of all, for anyone under the age of 21, Illinois enforces a strict zero-tolerance rule. This means that if a driver is under 21 years of age and has even a trace of alcohol in their system, they can be arrested for a DUI. This is also the legal limit for anyone operating a school bus with children on board. Also, those individuals holding a commercial driver's license are held to a higher standard and cannot operate a motor vehicle with a blood-alcohol level over .04. Finally, there is also one last caveat. Even if an adult is under the legal limit of .08, they can still be arrested and charged with a DUI if the officer can prove that the driver was driving impaired by alcohol or drugs.
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