The BMW was clocked doing 167 km/h on the M8.
A motorist has been arrested in Laois on suspicion of drug driving on a motorway.
Gardai from the Roads Policing Unit clocked the car at 167 kilometers an hour on the M8.
After the vehicle was stopped, cannabis and magic mushrooms were seized.
The driver has been taken to a Garda station, and has since been charged to appear before Portlaoise District Court.
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