California Car / Permit practice question · Alcohol & Drugs
Driving after using cannabis (marijuana) in California is:
Answer choices
- Illegal if it impairs your driving, the same as alcohol— Correct answer
- Always legal because cannabis is legal in California
- Legal as long as you are over 21
- Only illegal when driving on freeways
Why this is the answer
California's DUI laws apply to drugs as well as alcohol, so driving after using anything that affects your ability to drive safely is illegal. The handbook is also strict about cannabis in a vehicle: you may not smoke or eat it while driving, and an open container must stay in the trunk or where passengers do not sit.
Source: California Driver Handbook — Drugs and Driving
Content reviewed against official driver handbooks · August 12, 2026
More Alcohol & Drugs questions
- For a driver of any age who is on DUI probation, it is illegal to drive with a BAC at or above:
- Prescription and over-the-counter medicines:
- For a driver 21 years or older, it is illegal to drive with a blood alcohol concentration (BAC) at or above:
- According to the BAC table in the California handbook, what lowers your blood alcohol concentration after you drink?
- In California, it is illegal to have an open container of alcohol: