Alcohol, Drugs & DUI

Illinois follows the federal standard limiting commercial vehicle operators to a BAC below 0.04, half the limit for regular drivers. A CMV driver at or above 0.04 is subject to DUI and disqualification of commercial driving privileges. The stricter limit reflects the greater hazard posed by large vehicles.

Illinois' zero-tolerance law means drivers under 21 face license suspension if any trace of alcohol is detected in their system. A first violation results in a three-month suspension for a BAC above 0.00. This is separate from a full DUI charge, which still applies at 0.08 or for impairment at any level.

In Illinois a driver 21 or older is legally intoxicated at a BAC of 0.08 or higher. A diagram for this topic isn't available yet — the worked example below walks the same reasoning step by step.

• !Read each option carefully — distractors on Alcohol, Drugs & DUI are designed to look plausible.
• !Re-check the exact wording of the question stem before committing to an answer.
• !Watch the qualifiers ("always", "only", "except") that flip a correct-looking option.

Answer each from memory — you'll see instantly whether you're right and why.

Run a focused 10-question mini-mock on Alcohol, Drugs & DUI and see it stick.