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Difficulty: MediumBlood Alcohol Concentration (BAC) Limits and Thresholds

While operating a private passenger automobile, a 30-year-old driver submits to a chemical breath test following a minor traffic infraction. Under standard traffic safety laws, at or above what Blood Alcohol Concentration (BAC) percentage is an adult driver legally considered impaired per se?

  1. 0.08%Answer
  2. B
    0.04%
  3. C
    0.02%
  4. D
    0.05%

Answer

An adult non-commercial driver aged 21 or older is legally considered impaired per se at a Blood Alcohol Concentration (BAC) of 0.08% or higher.
Under standard driver licensing regulations, an adult driver aged 21 or older operating a private non-commercial vehicle is legally presumed impaired per se when their Blood Alcohol Concentration (BAC) reaches or exceeds 0.08%.

Step-by-Step Solution

1
Identify driver category and age group from scenario
The driver is 30 years old (adult aged 21 or older) operating a private passenger vehicle (non-commercial).
Statutory BAC thresholds vary depending on whether the driver is underage, operating a commercial vehicle, or an adult in a personal car.
2
Apply the statutory BAC limit for adult non-commercial drivers
The legal per se limit is established at 0.08% BAC.
At or above 0.08% BAC, chemical test evidence alone establishes legal impairment without needing further proof of physical driving impairment.

Key Concept

Standard Adult Non-Commercial BAC Legal Limit
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Topics

Blood Alcohol Concentration (BAC) Limits and Thresholds

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