Washington State Knowledge Test Alcohol, Drugs, and Driving 4

Question 1

In Washington, a driver 21 or older is considered impaired by marijuana with a THC blood concentration of at least:

Accepted Answer

5 nanograms per milliliter

Answer

Washington's per se THC limit for drivers 21 and older is 5.0 ng/mL of active THC in the blood.

Question 2

What is the legal THC blood limit for a Washington driver under age 21?

Accepted Answer

Any amount above 0.00 ng/mL

Answer

Drivers under 21 may not drive with any measurable THC in their blood.

Question 3

A commercial driver operating a commercial motor vehicle in Washington is considered impaired at a BAC of:

Accepted Answer

0.04%

Answer

The BAC limit for drivers operating a commercial vehicle is 0.04%, half the standard adult limit.

Question 4

Under Washington's implied consent law, what happens if you refuse a breath test after a lawful DUI arrest?

Accepted Answer

Your license is revoked for at least one year

Answer

Refusing a breath test results in license revocation for at least one year, and the refusal can be used as evidence in court.

Question 5

Which of the following medications could legally result in a DUI charge if it impairs your driving?

Accepted Answer

Any drug, including over-the-counter and prescription medicines

Answer

Being impaired by any drug, even one legally prescribed or bought over the counter, can lead to a DUI.

Washington State Knowledge Test Practice Test