Even with a prescription, EV drivers must stay under the 2mcg/L THC limit. A...

https://bravo-wiki.win/index.php/Cannabis_and_the_Roadside:_Why_Your_Prescription_Isn%27t_a_Get-Out-of-Jail-Free_Card

Even with a prescription, EV drivers must stay under the 2mcg/L THC limit. A medical defence exists, but DVLA rules remain key. Being prescribed cannabis is legal, but it doesn't excuse impairment. Legality doesn't replace personal responsibility.