Legal medical cannabis isn't a free pass. You’re still bound by the 2μg/L THC...

https://quebeck-wiki.win/index.php/Driving_an_EV_on_Unfamiliar_Roads_While_on_Medication:_A_Guide_to_Staying_Legal_and_Safe

Legal medical cannabis isn't a free pass. You’re still bound by the 2μg/L THC limit and DVLA fitness standards. While a medical defence exists, it doesn’t override impairment. Legality never replaces your primary duty to ensure you’re safe to drive.