Using medical cannabis? A prescription offers a statutory defence, but it...

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

Using medical cannabis? A prescription offers a statutory defence, but it doesn't grant immunity. You’re still bound by the 2mcg/L THC limit and DVLA fitness standards. Being 'legal' doesn't replace the responsibility to ensure you're fit to drive