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

https://claytonsimpressiveinsight.nexorafield.com/posts/do-police-accept-my-prescription-at-the-roadside-or-do-they-still-arrest-you

UK EV drivers using medical cannabis should be aware that 'in charge' laws apply even when parked and charging. The legal THC limit is 2 micrograms per litre of blood, and a roadside swab can prompt a blood test at the station