Medicinal cannabis

You must not drive

It’s illegal for you to drive if you’re being treated with medical cannabis that contains THC (delta-9-tetrahydrocannabinol). THC is the main psychoactive component in most cannabis.

You can’t use a valid prescription for medicinal cannabis to defend a charge if you test positive for THC in a roadside drug test.

We suggest you speak with your doctor regarding your specific prescription.

Why it’s illegal

Using THC can affect your ability to drive, including:

• being slower to react
• not staying in your lane
• not controlling the car as well
• not judging time and space well
• not keeping enough space between vehicles
• not staying alert.

Unlike alcohol, there’s no set amount of cannabis that makes it okay to drive. This means it’s hard to make a rule about how much is safe for driving.