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Selling It Right: Cannabis and driving

THC blood limits, roadside testing, the 90-day administrative prohibition, zero tolerance for new drivers and the rules for carrying cannabis in a vehicle.

  • 12 questions
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Cannabis and driving · Question 1Score 0/0

What is the THC cut-off for the roadside oral fluid screening test?

Study reference: B.C. cannabis law and LCRB guidance (Oct 2026), Ch. 11 Cannabis and driving — gov.bc.ca Cannabis and driving; CCLA s. 81; Canada's Lower-Risk Cannabis Use Guidelines

All 12 questions in this test

Every question and its answer choices. The correct answers and explanations appear when you take the test above.

  1. What is the THC cut-off for the roadside oral fluid screening test?

    1. 30 ng per mL
    2. 2 ng per mL
    3. 0.08 per cent
    4. 500 ng per mL

  2. Which combination brings more serious charges?

    1. A legal edible eaten the day before
    2. Over 2.5 ng/mL of THC plus alcohol
    3. Under 1 ng/mL of THC alone
    4. Any CBD with no THC at all

  3. Above what blood THC level can a driver face charges?

    1. Over 50 ng per mL of blood
    2. Over 100 ng per mL of blood
    3. Over 20 ng per mL of blood
    4. Over 2 ng per mL of blood

  4. What is the B.C. Administrative Driving Prohibition for a blood THC over 5 ng/mL within 2 hours of driving?

    1. An immediate 90-day driving prohibition
    2. A written warning for a first offence
    3. An immediate 3-day driving prohibition
    4. A $50 ticket with no other penalty or suspension of any kind

  5. What is the maximum Criminal Code penalty for driving under the influence of cannabis?

    1. 10 years in prison
    2. 6 months in jail
    3. A $5,000 fine only
    4. 2 years in prison

  6. What waiting time do Canada's lower-risk guidelines recommend before driving after cannabis?

    1. At least 6 hours
    2. At least 2 hours
    3. At least 30 minutes
    4. At least 1 hour

  7. How may an adult legally carry an opened package of cannabis in a car?

    1. In the cup holder right beside the driver
    2. In the glove box, within the driver's reach
    3. Out of the driver's reach, such as the trunk
    4. On the front passenger's lap during the trip

  8. A driver in B.C.'s Graduated Licensing Program has any THC in their system. What happens?

    1. Only a note added to their driving record
    2. Nothing, as long as THC is under 5 ng per mL
    3. A 30-day suspension and a $500 fine
    4. An immediate 12-hour licence suspension

  9. How much more likely are drivers with over 5 ng/mL THC to cause a fatal crash?

    1. About 10 per cent more likely
    2. About half as likely
    3. Nearly five times as likely
    4. No more likely at all

  10. What does B.C. say about driving after using CBD?

    1. It is not generally known to impair, but check first
    2. It always causes impairment, just like THC does
    3. It is banned for all drivers under any circumstances
    4. It doubles the effect of any alcohol in the blood

  11. What test may police require first if they suspect cannabis impairment?

    1. A breath alcohol test only
    2. A Standard Field Sobriety Test
    3. A written knowledge test
    4. An eye chart vision test at the side of the road

  12. How long does B.C. say you should wait after using cannabis before driving?

    1. Exactly one hour after any type of use
    2. There is no standard or safe waiting time
    3. Exactly 30 minutes after the last puff
    4. Until the smell of cannabis has gone away

Cannabis and driving: key rules to remember

Our summary of what the official handbook says on this topic, in our own words. Read it before or after the practice questions above, then check the original chapter. Read the official chapter ↗

Cannabis and driving (May 2026)

  • If you have used cannabis, do not drive; there is no standard or safe time to wait, and a person may not feel impaired but still be affected.
  • Blood THC limits: over 2 ng/mL can lead to charges; over 5 ng/mL, or over 2.5 ng/mL combined with alcohol, brings more serious charges.
  • Drivers with more than 5 ng/mL THC are nearly five times as likely to cause a fatal crash.
  • CBD is not generally known to impair, but know how it affects you before driving.
  • Police may require a Standard Field Sobriety Test; then a Drug Recognition Expert evaluation with a bodily fluid sample, or a blood sample.
  • The oral fluid screening test detects THC at a 30 ng/mL cut-off; a positive leads to a blood sample.
  • Criminal Code: maximum penalty for drug-impaired driving is 10 years in prison.
  • Motor Vehicle Act Administrative Driving Prohibition: immediate 90-day driving prohibition if blood THC is over 5 ng/mL, or 2.5 ng/mL with alcohol, within 2 hours of driving.
  • Graduated Licensing Program (L and N drivers): zero tolerance for any alcohol, THC or cocaine; immediate 12-hour suspension; N drivers restart the 24-month N period, learners redo testing.

Carrying cannabis in a vehicle

  • Allowed: up to 30 g in original unopened packaging; or up to 30 g opened/unpackaged but inaccessible to the driver (e.g. trunk); up to 4 non-flowering plants.
  • An adult must not drive with cannabis in the vehicle unless one of those exceptions applies.
  • Consuming cannabis as a passenger, or in a parked car on a public or forest service road, is illegal.

Lower-Risk Cannabis Use Guidelines

  • Wait at least 6 hours after using before driving; collision risk is 2 to 3 times higher; combining with alcohol is worse.

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