It is illegal for persons under age 21 to drive with any trace of alcohol or drugs in their system.

It is illegal for anyone to operate a motor vehicle on Illinois highways with any trace of a controlled drug, substance, or intoxicating compound in the blood. Drivers under age 21 will have their driving privileges suspended for three months if they are found to have had any trace of alcohol in their system after being stopped and issued a citation for a traffic violation.