The senior garda in charge of the Christmas road enforcement campaign has insisted the operation will not be affected by concerns about overtime.

Assistant Commissioner Michael Finn said the funding had been secured for the six-week operation.

It comes after Assistant Commissioner Pat Leahy told senior managers this week that no more overtime was to be incurred, except in relation to two operations targeting the Hutch and Kinahan gangs, and patrolling Dublin Port.

However, Taoiseach Leo Varadkar told the Dáil yesterday that December’s overtime would come from next year’s budget.

Assistant Commissioner Finn was also asked about the credibility of the campaign given the controversy surrounding falsified breath tests.

He said the figures for arrests for driving under the influence of drugs or alcohol during the first ten months of this year were up 12 per cent on the same period last year.

He said this shows that gardaí were on the streets and arresting any driver who they believed was under the influence.

He said 7,428 drivers were arrested on suspicion of driving under the influence (DUI) in the period from January to the end of October 2017, which compares to the 6,637 up to the end of October 2016.

Minister for Transport Shane Ross said that while he regretted that no one was disciplined for falsifying drink driving test figures, and he would like to see people disciplined, he believes that the current campaign is credible,

He said that reforms undertaken mean that garda figures will stand up to scrutiny.

The Christmas road safety campaign will run until 8 January with gardaí testing drivers for alcohol and drug use.