Medical cannabis users have a defence for the 2mcg/L THC limit, yet you must...
https://www.pop-bookmarks.win/legally-prescribed-cannabis-doesn-t-grant-a-free-pass-on-the-road-while
Medical cannabis users have a defence for the 2mcg/L THC limit, yet you must still meet DVLA fitness-to-drive rules. Legality isn't a substitute for responsibility; being prescribed doesn't exempt you from impairment laws