RPU says it seems to follow similar trends in the UK
More arrests have been made for drug driving so far this TT than drink driving, according to police here.
Anyone caught under the influence of drugs can be banned from driving for two years.
In the UK, significantly more drug-driving swabs are returning positive results despite more roadside alcohol tests being carried out.
Tom Duke and Matty Davison are from the Roads Policing Unit:
'No family should have to live indefinitely between two places'
Today marks two years since Ethan Richardson suffered a hypoglycaemic brain injury
Results of agricultural survey to be sent to prospective MHKs
Farmers recognised for contribution to Manx countryside
Port St Mary lifeboats called out after yacht drifts towards rocks
Vessel towed to safety after breaking mooring and drifting across Bay ny Carrickey
Ballafesson Methodist Chapel and Hall to officially close
Building to be put up for sale this Autumn