EV drivers using medical cannabis have a defence for the 2mcg/L THC limit, but...

https://evpowered.co.uk/feature/medical-cannabis-and-uk-driving-laws-what-ev-owners-must-know/

EV drivers using medical cannabis have a defence for the 2mcg/L THC limit, but DVLA fitness to drive remains key. Being legal isn't a free pass. From my underwriting days, I know that medical status never replaces your absolute duty of care on the road.