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Difficulty: MediumBlood Alcohol Concentration (BAC) Limits and Thresholds

A 24-year-old motorist operating a private passenger automobile is stopped by law enforcement for a non-working brake light. Under standard traffic safety laws, at or above what Blood Alcohol Concentration (BAC) limit is an adult non-commercial driver considered legally impaired per se?

  1. 0.08%0.08\%Answer
  2. B
    0.04%0.04\%
  3. C
    0.01%0.01\% to 0.02%0.02\%$
  4. D
    0.05%0.05\%

Answer

A Blood Alcohol Concentration (BAC) of 0.08%0.08\% or higher.
For non-commercial drivers aged 21 and older, driving with a Blood Alcohol Concentration (BAC) of 0.08%0.08\% or higher is illegal per se across standard driver licensing jurisdictions.

Step-by-Step Solution

1
Identify the driver category and age group described in the scenario.
The driver is an adult (2424 years old) operating a non-commercial private passenger vehicle.
Statutory BAC limits vary depending on age (under 21 vs. 21 and older) and vehicle type (commercial vs. non-commercial).
2
Apply the statutory BAC threshold for adult non-commercial drivers.
The statutory per se legal limit for adult non-commercial drivers is 0.08%0.08\%.
At a BAC of 0.08%0.08\% or greater, a driver is legally presumed impaired under standard state motor vehicle laws without requiring additional proof of driving performance failure.

Key Concept

Statutory BAC Limits for Adult Non-Commercial Drivers
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Topics

Blood Alcohol Concentration (BAC) Limits and Thresholds

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