Prescribed medical cannabis? Being legal doesn’t make you immune to...

https://www.bookmarkzoo.win/prescription-cannabis-doesn-t-grant-immunity-from-the-2mcg-l-thc-limit-or-dvla

Prescribed medical cannabis? Being legal doesn’t make you immune to prosecution. You must satisfy DVLA fitness-to-drive requirements, but even with a medical defence, exceeding the 2mcg/L THC limit can lead to a drug-drive charge