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Difficulty: MediumBlood Alcohol Concentration (BAC) Limits and Thresholds

A 19-year-old driver is pulled over for a minor traffic violation, and a breathalyzer test records a Blood Alcohol Concentration (BAC) of 0.02%0.02\%. Under statutory driver licensing laws, how is this BAC level legally classified for an underage driver?

  1. It is a violation of zero-tolerance laws because it meets or exceeds the statutory BAC limit for drivers under 21.Answer
  2. B
    It is legally permissible because the driver's BAC is below the standard 0.08%0.08\% adult limit.
  3. C
    It is legal unless law enforcement can prove the driver's physical control of the vehicle was visibly impaired.
  4. D
    It is legal provided the driver holds a standard passenger vehicle permit rather than a commercial license.

Answer

The BAC level of 0.02%0.02\% is a statutory violation because drivers under 21 years of age are subject to zero-tolerance limits (typically 0.01%0.01\% to 0.02%0.02\%), regardless of the higher 0.08%0.08\% limit applied to adults.
State traffic safety codes enforce zero-tolerance laws for drivers under 21 years of age. Under these statutes, driving with a BAC of 0.01%0.01\% to 0.02%0.02\% or higher is illegal per se, regardless of visible physical impairment or license type.

Step-by-Step Solution

1
Identify the driver classification and reported test metric.
Driver age is 19 (underage), and measured BAC is 0.02%0.02\%.
Statutory BAC limits vary based on driver age and license class.
2
Apply the statutory rule for drivers under 21 years old.
Zero-tolerance statutes set the strict limit for underage drivers at 0.01%0.01\%–0.02%0.02\%.
Underage drivers are prohibited from operating a vehicle with any measurable amount of alcohol in their system.
3
Evaluate the measured value against the statutory limit.
A BAC of 0.02%0.02\% reaches or exceeds the zero-tolerance limit, constituting an illegal violation.
The standard adult limit of 0.08%0.08\% does not apply to individuals under age 21.

Key Concept

Zero-Tolerance BAC Thresholds for Underage Drivers
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Topics

Blood Alcohol Concentration (BAC) Limits and Thresholds

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