California Alcohol and Drugs (DUI) Practice Test

This free test has 28 new questions on alcohol, drugs and driving in California: BAC limits, medicines and cannabis, chemical tests, open containers, rules for drivers under 21, and what happens after a DUI arrest or conviction. You need 23 correct (80%) to pass, and every answer links to Section 9 of the California Driver’s Handbook.

Unofficial practice test 28 questions · pass at 80% (23 correct)

0 / 28 answered · 0 correct
  1. According to the California Driver's Handbook, how does growing older affect a person's tolerance to alcohol?
  2. You drink a large amount of an alcohol-based cough syrup and then get behind the wheel. How does California law view this?
  3. You drink one beer and take an allergy pill. Neither one alone usually affects you, but together they make you drowsy. May you legally drive?
  4. You plan to drive after starting a new medicine. What does the handbook tell you to do?
  5. An officer believes you are driving under the influence of drugs and asks you to submit to a blood or urine test. You refuse. For how long will DMV suspend or revoke your driving privilege?
  6. You are a 30-year-old passenger in a friend's private car (not a bus, taxi, camper, or motorhome). May you drink a beer during the ride?
  7. You are 25 and driving your own car. Which of these is illegal?
  8. What does your blood alcohol concentration (BAC) measure?
  9. A 40-year-old driver who is not on DUI probation is driving a vehicle for which a commercial driver's license is required. What is the lowest BAC at which it is illegal for this driver to drive?
  10. Your BAC is below the legal limit that applies to you. Which statement matches the handbook?
  11. An officer stops a driver who is clearly impaired by alcohol, but no BAC measurement is ever taken. Can the driver still be convicted of DUI?
  12. The handbook includes a chart that estimates BAC. Which factors does that chart use for its estimates?
  13. Does California's ban on drinking alcohol or taking drugs while operating apply to a boat or a jet ski?
  14. When do you agree to chemical testing (breath, blood, or urine) if an officer suspects you of DUI?
  15. You are arrested for DUI but have not been convicted in court. What does California's Administrative Per Se law require DMV to do?
  16. Which of these is required of every driver convicted of DUI?
  17. After a DUI conviction, which document must you file?
  18. What does the handbook say about an ignition interlock device (IID) after a DUI conviction?
  19. If you are convicted of DUI, up to how long may you be sentenced to jail, according to the handbook?
  20. After a DUI conviction, what may happen to your vehicle?
  21. A driver under the influence of alcohol causes a crash that seriously injures someone. Besides criminal penalties, what else may the driver face?
  22. A driver was convicted of DUI four years ago and is now convicted of DUI again. What does the handbook say?
  23. A 19-year-old is driving alone and carrying closed containers of beer for an employer. When is this allowed?
  24. A licensed 18-year-old driving alone is caught with alcohol in the vehicle, and no exception applies. Besides impounding the vehicle, what may the court do?
  25. A 16-year-old who has never had a driver's license is caught carrying alcohol in their vehicle with no one 21 or older present and no exception applying. What may the court ask DMV to do?
  26. An officer suspects that a 20-year-old driver has been drinking alcohol. What may the officer require the driver to do?
  27. A 19-year-old is convicted of DUI, and their BAC was at least 0.01%. What may DMV do to their driving privilege?
  28. A 20-year-old driver's PAS reads 0.06%, and a follow-up breath test also shows a BAC of 0.06%. What may happen next?

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California BAC limits

It is illegal to drive with a blood alcohol concentration (BAC) at or above these levels:

WhoIllegal BACPractice
Drivers 21 and older0.08% or higherTest 1
Drivers of vehicles that need a commercial license0.04% or higherthis test
Drivers carrying passengers for hire0.04% or higherTest 3
Drivers under 210.01% or higherTest 1
Anyone on DUI probation, at any age0.01% or higherTest 4

Being under the limit does not make you safe to drive: the handbook says nearly everyone is affected below it, and you can be convicted of DUI without any BAC reading if you are impaired. Driving impaired by a prescription or over-the-counter medicine, or by any mix of alcohol and drugs, is also illegal, and so is using cannabis while you drive or ride in a vehicle.

Rules for drivers under 21

SituationRulePractice
Carrying alcoholOnly with someone 21 or older in the vehicle (in a full, sealed container), or when working for an employer with an off-site liquor sales license.Test 2, this test
Caught with alcohol illegallyThe vehicle may be impounded for up to 30 days; the court may fine you and suspend your license for one year, or delay your first license by up to one year.Test 4, this test
Suspected of drinkingAn officer can require a hand-held breath test, a PAS or another chemical test. A PAS of 0.05% or more can lead to a further breath or blood test.Test 4, this test
DUI conviction at 0.01% or moreDMV may revoke your driving privilege for one year.this test

Tests, arrests and convictions

StageWhat happensPractice
Refusing a chemical testDMV suspends or revokes your driving privilege for one year. By driving in California you have already agreed to testing.Test 1, this test
ArrestThe officer may take your license and give you a 30-day temporary license. You have 10 days to ask DMV for a hearing, and DMV must suspend your privilege even before any conviction.Test 3, Test 4, this test
ConvictionYou must complete a DUI program and file proof of insurance (SR 22/SR 1P). You may face up to six months in jail, an ignition interlock device, and impound of your vehicle with a storage fee.this test
Your recordA DUI stays on your record for 10 years, and another DUI in that time can bring added penalties.Test 1, this test

Read the full rules in Section 9: Alcohol and Drugs. Penalties can change, so confirm current rules on dmv.ca.gov.

Keep studying

Try the right-of-way test, the parking test and the road signs test, or read how to study for the California permit test.