Medical cannabis users have a legal defence for the 2mcg/L THC limit, but...

https://miloyyxi461.huicopper.com/if-i-am-under-the-thc-limit-am-i-definitely-safe-legally

Medical cannabis users have a legal defence for the 2mcg/L THC limit, but legality doesn’t equal road safety. DVLA fitness standards still apply. Having a prescription isn't a free pass; you remain responsible for your driving. Stay informed and safe.