Medical cannabis doesn't grant immunity on the road. You remain subject to the...

https://www.yankee-bookmarkings.win/prescribed-cannabis-isn-t-a-free-pass-while-a-medical-defence-exists-for-the

Medical cannabis doesn't grant immunity on the road. You remain subject to the 2mcg/L THC limit and DVLA fitness standards. While a medical defence exists, legality doesn’t replace responsibility. Being legal isn't the same as being unimpaired.