An M50 motorist was arrested after testing positive for cocaine.
Gardai stopped a vehicle after spotting it driving "in an erratic manner" on the busy motorway.
The driver tested positive for cocaine following a roadside test.
They were arrested and taken to a garda station where they had to provide a blood sample.
A garda spokesperson said on Twitter: "DMR East Roads Policing Unit stopped a vehicle on the M50 after observing it driving in an erratic manner.
"Roadside test carried out and returned positive reading for cocaine.
"Driver arrested and conveyed to station where a blood sample was provided. Investigations ongoing."
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