Medical cannabis is legal, but roadside tests don’t distinguish between...

https://aged-wiki.win/index.php/Do_I_Need_to_Tell_My_Car_Insurance_About_Prescribed_Medication_in_the_UK%3F

Medical cannabis is legal, but roadside tests don’t distinguish between prescription and illicit use. Stay under the 2mcg/L THC limit or rely on the medical defence. DVLA fitness standards still apply