Gardaí are holding the daughter of convicted drug dealer John Gilligan at Santry Garda Station on suspicion of laundering proceeds from the sale of drugs.
Ms Tracey Gilligan (28) was arrested at Dublin Airport yesterday after €20,000 was reportedly discovered in a suitcase she was carrying.
Customs officers seized the cash as Ms Gilligan was about to board a flight to Alicante in Spain.
Ms Gilligan is being held on suspicion of breaching money laundering provisions in drug trafficking legislation. She can be held for a maximum of seven days.