A person will appear in court in the coming weeks after they were found to be doing 80 kilometres over the speed limit at a checkpoint in Roscommon on Friday.
They also tested positive for drug use.
The Roscommon/Longford Roads Policing unit detected the car to be travelling at 181 kilometres an hour in a 100 kilometre speed zone on last Friday.
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A roadside oral fluid test was also carried out and the driver tested positive for cannabis.
The driver was arrested at the scene and a court appearance will follow.
