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Guides, downloads and videos to help patients, families and professionals understand prescribed cannabis-based medicines — shared by the organisations behind MCAW.
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So, You Were Stopped by the Police: Driving
A Roadside Survival Guide for Medical Cannabis Patients and All Motorists
If you have been stopped by police while driving with a medical cannabis prescription, this guide explains what may happen next, what roadside tests can and cannot prove, and how to respond calmly and lawfully.
More about this resource
It is designed for medical cannabis patients and all motorists across the UK who need clear information about police stops, saliva testing, impairment assessments, arrest, custody and evidential blood samples.
The Roadside Survival Guide also explains the difference between having THC in your body and being impaired, when the medical defence may apply in Great Britain, what evidence you should keep, and what steps to take if you believe something went wrong. It is a practical public information resource and does not replace legal or medical advice.
UK-wide edition. Legal review date: 31 July 2026.
Resources are shared for information and are not medical advice. Always talk to your prescribing clinician about your treatment. Read our medical disclaimer.
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