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A woman was arrested in
Blachardstown, Dublin, on suspicion of drink-driving after the Garda Commissioner intervened in a road traffic incident.
Drew Harris was being driven to Garda (Irish police) headquarters at about 17:30 BST on Wednesday when he saw a car being driven erratically, RTE reports.
He then called the Road Policing Unit.
The Commissioner is a former deputy chief constable of the PSNI, who started the job in September.
Gardai (Irish police) confirmed that Mr Harris was present at the scene.