A court appearance is to follow.
A motorist has been arrested after being detected travelling at 170km/h on the M8 outside Cahir, county Tipperary.
A Tipperary Roads Policing Unit motorcyclist, who was monitoring traffic on the motorway, stopped the vehicle and conducted a roadside drug test on Sunday afternoon.
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The driver failed a roadside drug test for cocaine and cannabis.
They were arrested on suspicion of drug driving and dangerous driving.
A court appearance is to follow.
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