For EV drivers using medical cannabis, a prescription offers a medical defence...

https://lukasiwad089.theburnward.com/adas-explained-why-your-car-isn-t-a-self-driving-chauffeur-and-why-you-need-to-stay-legal

For EV drivers using medical cannabis, a prescription offers a medical defence but doesn't override the 2mcg/L THC limit. You must notify the DVLA of your fitness to drive. Remember: legality doesn’t replace responsibility—stay safe on the road.