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Difficulty: MediumBlood Alcohol Concentration (BAC) Limits and Thresholds

A 19-year-old motorist operating a personal passenger vehicle is stopped by law enforcement for a minor equipment violation and requested to submit to a chemical breath test. Under zero-tolerance impaired driving laws for motorists under 21 years of age, at or above what Blood Alcohol Concentration (BAC) threshold is the driver legally considered impaired?

  1. 0.01%Answer
  2. B
    0.04%
  3. C
    0.08%
  4. D
    0.10%

Answer

0.01% (Zero-tolerance statutory threshold for drivers under 21 years old)
For drivers under 21 years of age, zero-tolerance laws establish that driving with any detectable amount of alcohol—specifically a Blood Alcohol Concentration (BAC) of 0.01% or higher—is illegal per se.

Step-by-Step Solution

1
Identify driver category and age classification from the scenario
Driver is 19 years old (under 21 years of age)
Traffic laws categorize drivers under 21 under special Zero Tolerance statutory regulations.
2
Determine the applicable statutory BAC threshold
Zero-tolerance laws enforce a strict BAC threshold of 0.01% to 0.02% (statutoriely 0.01% per se limit in standard driver safety standards)
Underage drivers are legally prohibited from consuming any alcohol prior to driving, establishing the per se impairment threshold at 0.01%.

Key Concept

Underage Zero Tolerance BAC Thresholds
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Topics

Blood Alcohol Concentration (BAC) Limits and Thresholds

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