Introduction
We recently had an enquiry about the use of medical marijuana and whether people with such a prescription can drive. We asked around, and thought the answers would be worth sharing more widely. With grateful thanks to Olly Tayler from The Honest Truth for his help.
Olly says – Basically, you can legally drive whilst using medically prescribed Cannabis provided you are not impaired whilst doing so.
Key Rules for Driving with Medical Cannabis
Do Not Drive Impaired
It is an offence to drive while impaired by any medication, including medical cannabis. If you experience drowsiness, poor coordination, dizziness, or slowed thinking, you must not drive. The responsibility to assess your fitness to drive is ultimately yours.
Follow Medical Guidance
You must adhere to the dosage and directions provided by your specialist consultant and the manufacturer/distributor.
Carry Evidence
Always carry proof of your prescription in case you are stopped by the police. Recommended documentation includes:
- A physical or digital copy of your most recent prescription.
- A letter from your prescribing specialist confirming your patient status.
- Photo ID (e.g., your driving licence).
- The medication in its original, labelled packaging.
Some clinics provide a Medical Cannabis Card that can be scanned by police to verify your prescription.
Inform Authorities (Recommended)
The DVLA (Driver and Vehicle Licensing Agency) advises that you inform them of any medical condition or medication that may affect your driving ability. It is also recommended to inform your car insurance company to avoid issues in the event of a collision.
If Stopped by the Police
Stay Calm and Inform
Politely inform the police officer that you are a legal medical cannabis patient and offer to show your documentation.
Cooperate
You may still be asked to perform a “field impairment assessment” (e.g., walking in a straight line) or a roadside drug swab. It is best to comply with these requests, as failing to provide a specimen can lead to separate charges.
Assert Your Defence
If a blood test is required and shows THC levels above the limit, your prescription provides a “statutory medical defence” against the charge, provided you were not impaired at the time of driving.
Seek Legal Advice
If arrested, request a solicitor immediately and inform them of your medical defence.
Important Considerations
Impairment Varies
The effects of medical cannabis (THC) can vary based on dosage, tolerance, and consumption method. Vaping effects may last 2-4 hours, while ingestible forms can last up to 6 hours or more.
Zero Tolerance Law & The Defence
The law has a “zero tolerance” limit for THC, meaning you will likely test positive. The medical defence is crucial to protect you in this situation, but it only applies if you were not impaired.
New Patients
Take extra care when first starting treatment or changing your dosage, and avoid driving until you know exactly how it affects you.
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