Illinois Law Enforcement Training and Standards Board (ILETSB) Practice Exam

How many clues are necessary to indicate a blood alcohol concentration (BAC) at or above 0.08?

1. 1 or more

2. 2 or more

3. 3 or more

4. 4 or more

The correct answer is: 2 or more

In Illinois, the law surrounding driving under the influence establishes that a driver’s blood alcohol concentration (BAC) of 0.08 or higher is considered evidence of impairment. To support a conviction or administrative determination regarding this level of intoxication, law enforcement officers rely on observable clues that suggest impairment. A minimum of two clues is necessary to indicate that a person is likely above the legal limit of 0.08. These clues can include a variety of behaviors, physical signs, and other indicators observed during an interaction with a driver. The reliance on a combination of clues helps to establish a more comprehensive assessment of a driver's condition. This approach mitigates the chances of misidentifying impairment based solely on one sign, thus ensuring that there is sufficient evidence to support the claim of being over the legal limit. While some other options suggest a higher number of clues, the legal standard specifically dictates that two distinct indications are generally enough to warrant further action, such as administering a breath test. Hence, the rationale for requiring two clues stems from the need for a balanced approach that provides fair and just assessment while addressing road safety effectively.