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Difficulty: HardBlood Alcohol Concentration (BAC) Limits and Thresholds

Under standard statutory driver licensing laws, different Blood Alcohol Concentration (BAC) per se limits apply depending on a driver's age and the operational classification of the vehicle being driven. Which of the following drivers has reached or exceeded their applicable statutory per se legal BAC threshold?

  1. A 20-year-old individual driving a personal sedan with a recorded BAC of 0.02%0.02\%Answer
  2. B
    A 30-year-old off-duty commercial driver operating their private personal passenger car with a recorded BAC of 0.05%0.05\%
  3. C
    A 45-year-old non-commercial driver operating a personal passenger vehicle with a recorded BAC of 0.06%0.06\%
  4. D
    A 38-year-old commercial truck driver operating a commercial tractor-trailer with a recorded BAC of 0.03%0.03\%

Answer

The 20-year-old individual driving a personal sedan with a recorded BAC of 0.02%0.02\% has reached their applicable statutory per se legal limit.
Under statutory traffic safety laws, drivers under the age of 21 are governed by zero-tolerance laws that set the legal per se BAC threshold at 0.01%0.01\% to 0.02%0.02\%. Therefore, a 20-year-old driver with a BAC of 0.02%0.02\% meets or exceeds the statutory threshold.

Step-by-Step Solution

1
Identify statutory BAC limits for each driver classification and vehicle operating context.
Under 21 drivers: zero tolerance (0.01%0.01\% to 0.02%0.02\% limit); Adult non-commercial in personal vehicle: 0.08%0.08\% limit; Commercial driver operating commercial vehicle: 0.04%0.04\% limit; Commercial driver operating personal vehicle: 0.08%0.08\% limit for standard DUI per se.
Different statutory thresholds apply based on age, license type, and the type of vehicle being operated at the time of testing.
2
Compare each driver's recorded BAC against their respective statutory limit.
The 20-year-old driver's BAC of 0.02%0.02\% meets the zero-tolerance limit of 0.02%0.02\%. All other listed drivers have recorded BAC levels below their respective operational limits (0.05%<0.08%0.05\% < 0.08\%, 0.06%<0.08%0.06\% < 0.08\%, and 0.03%<0.04%0.03\% < 0.04\%).
Only the underage driver meets or exceeds their specific statutory threshold.

Key Concept

Statutory BAC legal limits vary by driver age and vehicle classification: 0.08% for adult non-commercial drivers, 0.04% for commercial vehicle operators, and 0.01%–0.02% zero tolerance for drivers under 21.
Estimated Time:2m 0s
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Topics

Blood Alcohol Concentration (BAC) Limits and Thresholds

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