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

https://emiliojqnl442.iamarrows.com/what-does-fitness-to-drive-mean-for-dvla-decisions-a-claims-handler-s-perspective

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.