If you’re a medical cannabis patient, being 'legal' isn't a free pass. Even...

https://wiki-tonic.win/index.php/What_happens_if_I_crash_and_THC_is_found_in_my_blood%3F

If you’re a medical cannabis patient, being 'legal' isn't a free pass. Even with a medical defence, you must meet DVLA standards and stay under the 2mcg/L THC limit. Legality doesn't replace personal responsibility; if you’re impaired, don't drive.