Officers from Revenue's Customs Service, along with help from a four-legged colleague, discovered €63,800 and stg£2,160 at Dublin Airport.
The cash was hidden in the baggage of a Polish man (32), who was about to leave on a flight to Krakow.
It was seized under the proceeds of crime legislation.
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Detection dog Barney gave a positive reaction to the man's luggage during routine passenger checks yesterday.
Officers were granted a three month detention order by Judge Halpin in the Criminal Courts of Justice to carry out further investigations.