Medical cannabis prescriptions aren't a road pass. You’re still bound by the...

https://wiki-saloon.win/index.php/If_I_Miss_a_Dose_or_Take_Extra,_Does_That_Affect_My_Right_to_Drive%3F

Medical cannabis prescriptions aren't a road pass. You’re still bound by the 2mcg/L THC limit and DVLA fitness standards. A medical defence is no substitute for your duty to drive safely