Driver's License Test Prep
Oregon Practice DUI & Impaired Driving

You're 19 years old and driving in Oregon. What blood alcohol concentration will cause you to fail an Oregon BAC test?

  1. A.
    0.08% or more, the same threshold as drivers 21 and older.
  2. B.
    Any amount, but only if you also fail field sobriety tests.
  3. C.
    Any amount, only after a prior DUII conviction.
  4. D.
    Any amount, because Oregon's zero-tolerance law applies to all drivers under 21. Correct
The Why

The answer is "Any amount, because Oregon's zero-tolerance law applies to all drivers under 21."

Oregon's Implied Consent section sets a zero-tolerance rule for drivers under 21: any measurable blood alcohol concentration fails the chemical test. The 0.08% per-se threshold applies only to drivers 21 and older. The under-21 rule is unconditional. It does not require failed field sobriety tests, a prior conviction, or visible impairment to trigger a failed test.

Why the others miss

The traps in the wrong answers

A. 0.08% or more, the same threshold as drivers 21 and older.

The 0.08% threshold applies only to drivers 21 and older; the manual sets under-21 failure at any amount. Misreading: Applies the adult 0.08% per-se BAC limit to an under-21 driver, ignoring Oregon's separate zero-tolerance rule for drivers under 21.

B. Any amount, but only if you also fail field sobriety tests.

The manual's chemical-test failure for under-21 drivers is unconditional; it does not depend on field sobriety test results. Misreading: Treats Oregon's under-21 zero-tolerance rule as conditional on showing impairment, when the manual fails the chemical test at any amount on its own.

C. Any amount, only after a prior DUII conviction.

Oregon's zero-tolerance rule applies to every under-21 driver, not just those with prior offenses. Misreading: Limits the under-21 zero-tolerance rule to repeat offenders, when the manual applies it to all drivers under 21 regardless of record.

The Rule

This question tests your knowledge of DUI & Impaired Driving in Oregon. Source: Oregon Driver Manual, "Dangerous Driving Behaviors - Impaired Driving," p.83..

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