Driving with medical cannabis needs more than paperwork. While a medical...

https://web-wiki.win/index.php/Driving_with_Medical_Cannabis:_A_Practical_Guide_for_the_Roadside

Driving with medical cannabis needs more than paperwork. While a medical defence covers the 2mcg/L THC limit, you must still meet DVLA fitness standards. Being legal isn't being safe; your responsibility remains