UK EV drivers using medical cannabis should be aware of the ‘in charge’ rules...

https://online-wiki.win/index.php/Is_It_Illegal_to_Smoke_Prescribed_Medical_Cannabis_in_the_UK%3F

UK EV drivers using medical cannabis should be aware of the ‘in charge’ rules that apply even when parked and charging. The legal THC limit is just 2 micrograms per litre of blood