It’s illegal in England, Scotland and Wales to drive with legal drugs in your body if it impairs you’re driving. Under section 4 of the road traffic act 1988, it is an offence to drive,attempt to drive or be in charge of a vehicle while unfit because of drugs. However section 5A of the road traffic act 1988 allows for the taking of medicinal cannabis as long as the driver can show that the drug has being prescribed or supplied for medical purposes and that the drug has being taken in accordance with the doctor’s instructions.You can drive after taking medicinal cannabis if:
- You’ve been prescribed them and followed advice on how to take them by a healthcare professional
- They are not causing you to be unfit to drive even if you’re above the specified limits
- Have evidence that you are on medicinal cannabis for medical reasons.
-4 hours after inhalation
-8 hours after oral ingestion
By law at the end of the day whether you are fit or unfit to drive that decision lies with the person taking the medicinal cannabis.