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:
Southern 100 planning to run classic sidecars for 2026
It's after modern machines were excluded from July event
BMA to ballot doctors in the IOM for industrial action
It's amid ongoing disputes over pay and working conditions
Manx air quality 'significantly' better than UK average
Study held over two years monitors air pollution near schools
Visitors told "take extra care" as TT Fan Park to reopen
Access via Grandstand only as areas remain 'soft underfoot'