Prescribed medical cannabis doesn’t exempt you from the 2mcg/L THC limit. While...

https://blogfreely.net/neasalnfbo/h1-b-the-medication-minefield-how-to-safely-test-new-doses-without-risking

Prescribed medical cannabis doesn’t exempt you from the 2mcg/L THC limit. While a medical defence exists, it’s not a blank cheque. You must meet DVLA fitness-to-drive standards, and remember: legal status isn’t a substitute for impairment-free driving