Carlow Roads Policing Unit performing speed checks on the M9 on Thursday evening stopped a vehicle for a speeding offence, when they detected the vehicle doing a speed of 154km/h.
An oral specimen from the driver also proved positive for cannabis.
The driver was arrested and conveyed to Carlow Garda Station for a blood test.
Gardaí said: "Never drive while under the influence of an intoxicant."
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