UK EV drivers using medical cannabis should be aware that the 'in charge' laws...

https://www.booknose.win/uk-ev-drivers-prescribed-medical-cannabis-should-know-the-in-charge-rules

UK EV drivers using medical cannabis should be aware that the 'in charge' laws apply even when parked and charging. With a strict 2 micrograms per litre THC limit, a positive roadside swab can trigger a blood test, regardless of a prescription