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Difficulty: MediumBlood Alcohol Concentration (BAC) Limits and Thresholds

An adult motorist aged 2525 operating a private non-commercial passenger vehicle is administered a breathalyzer test during a traffic stop, revealing a Blood Alcohol Concentration (BAC) of 0.08%0.08\%. Based on standard traffic safety laws, which statement accurately describes the legal implication of this test result?

  1. The driver has reached the statutory threshold for per se driving under the influence (DUI).Answer
  2. B
    The driver remains within legal limits because standard passenger vehicle drivers are permitted a BAC up to 0.10%0.10\%.
  3. C
    The driver is only subject to zero-tolerance penalties if operating a commercial motor vehicle.
  4. D
    The test result cannot be used to establish impairment unless the chemical test reader measures at least 0.15%0.15\%.

Answer

The driver has reached the statutory threshold for per se driving under the influence (DUI).
For non-commercial drivers who are 21 years of age or older, operating a motor vehicle with a Blood Alcohol Concentration (BAC) of 0.08%0.08\% or higher is illegal per se. Reaching this statutory threshold establishes legal intoxication regardless of whether physical signs of impairment are observed.

Step-by-Step Solution

1
Identify driver category and age
The driver is an adult (2525 years old) operating a non-commercial private motor vehicle.
Statutory BAC thresholds vary based on driver age and vehicle classification.
2
Recall statutory BAC limits
The per se BAC limit for adult non-commercial drivers aged 21 and older is 0.08%0.08\%.
Operating a motor vehicle at or above 0.08%0.08\% BAC constitutes an automatic (per se) DUI offense under standard state traffic laws.
3
Evaluate the chemical test result against the statutory limit
A BAC result of 0.08%0.08\% matches the legal limit for per se intoxication.
At 0.08%0.08\% BAC, proof of physical impairment is not required to charge a driver with DUI because reaching the threshold itself constitutes a violation.

Key Concept

Blood Alcohol Concentration (BAC) Legal Limits for Adult Drivers
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Topics

Blood Alcohol Concentration (BAC) Limits and Thresholds

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