Medical cannabis users face road safety complexities. While a 2mcg/L THC limit...

https://remote-wiki.win/index.php/Medical_Cannabis_and_Driving:_Your_DVLA_Responsibilities_and_the_Law

Medical cannabis users face road safety complexities. While a 2mcg/L THC limit has a statutory medical defence, it’s not blanket immunity. You must still meet DVLA fitness standards