Impaired driving — Washington Permit Test
Impaired driving on the Washington permit test — 9 rules, each with the reason behind it and a question on it while it is fresh.
The rules
Driving under the influence of alcohol or drugs is illegal in Washington under RCW 46.61.502.
Alcohol takes away the judgment you would need to notice that it has.
In Washington, it is illegal to drive under the influence of alcohol or drugs (RCW 46.61.502).
A driver aged 21 or older is considered under the influence at a blood alcohol concentration of 0.08 percent or higher.
Sleeping it off is the only thing that lowers the number, and coffee is not it.
BAC of 0.08% or more
A driver under 21 faces the same consequences at a blood alcohol concentration of 0.02 percent.
Under 21 you cannot drink legally at all, so the state sets the driving number just above what a test can measure.
BAC of 0.02% or more
A driver aged 21 or older is considered under the influence with more than 5 nanograms of active THC per milliliter of blood.
Cannabis is legal to buy at 21 and still illegal to drive on, and the blood test is where those two facts meet.
having more than 5 nanograms of active THC per milliliter of blood in their system is considered a DUI and can result in legal consequences.
A driver under 21 faces the same consequences for anything above 0 nanograms of active THC per milliliter of blood.
There is no allowance to work with under 21, so any trace at all is the whole of the offense.
Drivers under age 21 have the same potential consequences for anything more than 0 nanograms of active THC per milliliter of blood in their system.
Under the Implied Consent Law, everyone who drives in Washington agrees to be tested if an officer suspects they are under the influence.
Consent comes with the license, so refusing at the roadside is a separate thing from whether you were drunk.
Under The Implied Consent Law (RCW 46.20.308), everyone who drives in Washington agrees to be tested if an officer suspects they are under the influence of alcohol or drugs.
Refusing a test can cost a driver their driving privilege for 90 to 730 days, or until they reach age 21, whichever is longer.
Refusing does not make the case go away; it adds a suspension that does not depend on the case at all.
If you refuse to be tested, you could lose your driving privilege for 90 to 730 days, or until you reach age 21, whichever is longer.
A driver can be charged with driving under the influence while in physical control of a parked vehicle, under RCW 46.61.503.
If you can start it and move it, the law treats you as driving it, which is why sleeping in the driver's seat does not help.
DUI also applies to being in control of a vehicle, even if it’s parked (RCW 46.61.503).
Alcohol- and drug-related offenses appear on a Washington driving record for life.
Insurance and employers read that record for decades, so one night follows the driver much further than the suspension does.
Alcohol- and drug-related offenses appear on your driving record for life.
On the test
What does Washington law say about driving under the influence of alcohol or drugs?
It is illegal, and the law that says so is RCW 46.61.502. Alcohol takes away the judgment you would need to notice that it has. Washington State Driver Guide, p.37: “In Washington, it is illegal to drive under the influence of alcohol or drugs (RCW 46.61.502).”
How this works
Most practice tests hand you a bank of questions and leave the manual somewhere else. This one puts them together.
You read one law and the reason behind it, then answer a question on that law while it is still fresh. Get it right and you move on; get it wrong and you have found the gap while it is cheap to fix, not on the morning of the exam.
Learning one rule at a time, and proving it immediately, is what turns a manual you skimmed into something you actually know — and it makes studying feel like getting somewhere rather than like waiting to find out.
What it costs
- One payment, once — not a subscription. Nothing renews and there is nothing to cancel, for an exam you sit one time.
- Free to start: a 10-question test and the first section of cards. No sign-up and no account.
- Paying opens the rest of the cards, unlimited full-length practice tests, and retests built from exactly the questions you got wrong.
- Every level up to Prepared — 3 tests passed in a row.
- Do the work, fail the real exam, and we refund you.
Where these come from
Every rule here is checked against Washington State Driver Guide, published by the Washington State Department of Licensing, and against the state code itself. Last checked 2026-09-14.
- src/assets/drivers-manuals/WA.pdf (Washington State Driver Guide, Washington State Department of Licensing, retrieved 2026-09-14)
- https://dol.wa.gov/driver-licenses-and-permits/driver-training-and-testing/driver-guides
- https://dol.wa.gov/driver-licenses-and-permits/driver-training-and-testing/do-i-need-take-test