Independent TD Clare Daly has admitted drinking a hot whiskey as she awaits results of a blood sample for suspected drink-driving.
The Dublin North representative said she took the drink for a cold before midnight on Monday after spending two hours with a family in the south of the city.
"I had no food since lunchtime and did not realise the implications of taking this house measure of hot whiskey," she said.
Ms Daly was pulled over by gardai on the South Circular Road when she made an illegal right turn shortly after leaving the home.
She was unable to give a roadside breath test and was taken to Kilmainham Garda Station where a blood sample was taken.
The tests have been sent to the garda road safety bureau and the results are not expected for around another two weeks.
"I accept full responsibility for what is a serious lack of judgment. I believe that the gardai implementing road safety have a job to do and I support them," she said in a statement on her website.
"Should the test result on the sample provided prove to be above the statutory limit, I will accept the consequences and resolve that this will not happen again."
Ms Daly said she was surprised that details of the incident were leaked without any charges having been brought or confirmation of her being over the limit.
The former Socialist Party member was one of a small number of TDs who late last year exposed allegations that gardai had wiped penalty points from the driving licences of several high-profile people.