Driving an EV doesn't exempt you from drug-drive laws. If you hold a medical...

https://edwinxrml916.lucialpiazzale.com/can-a-specialist-doctor-prescription-protect-me-from-prosecution

Driving an EV doesn't exempt you from drug-drive laws. If you hold a medical cannabis prescription, testing above the 2μg/L limit requires a formal medical defence. You must also notify the DVLA if your condition or meds affect your fitness to drive