Driving with prescribed medical cannabis involves more than just holding a...

https://lorenzotlqm095.timeforchangecounselling.com/can-a-specialist-doctor-prescription-protect-me-from-prosecution

Driving with prescribed medical cannabis involves more than just holding a prescription. While a medical defence exists for the 2µg/L THC limit, it isn't a free pass. Drivers must notify the DVLA and remain fully fit to operate their vehicle