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

https://ace-wiki.win/index.php/Do_Other_Prescriptions_Increase_the_Risk_if_I_Use_Medical_Cannabis%3F

UK EV drivers using medical cannabis should be aware of the ‘in charge’ rules. Even when parked and charging, the 2 micrograms per litre THC limit applies. A roadside swab can trigger a compulsory blood test, regardless of prescription status