Medicated cannabis users must understand: a prescription isn't a blanket legal...

https://www.third-bookmarks.win/using-medical-cannabis-a-prescription-offers-a-statutory-defence-but-it-1

Medicated cannabis users must understand: a prescription isn't a blanket legal shield. While a medical defence exists for the 2mcg/L limit, you must declare conditions to the DVLA. Legality doesn't override your duty: if you're impaired, don't drive.