Garda Commissioner Drew Harris assisted in arresting a woman suspected of drink-driving in Dublin on Tuesday.
Commissioner Harris was returning from a meeting at Garda Headquarters when he noticed a car being driven erratically in Blanchardstown.
He notified local Gardaí, and members of the Road Policing Unit attended the scene at 5.30pm.
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A woman was arrested and taken to Blanchardstown Garda station.
Gardaí have confirmed that the Commissioner Harris 'was present at a road traffic incident during which a driver was arrested for a road traffic offence.'