Gardaí seized cocaine worth an estimated €70,000 after stopping and searching a car as part of a planned operation in Terenure in south Dublin last night.
Two men, aged 28 and 39m were arrested at the scene shortly after 7pm and taken to Terenure Garda station under Section 2 of the Criminal Justice Act.
A 34-year-old woman was arrested and a house searched as part of a follow-up operation. She was taken to Rathmines Garda station for questioning.
Gardaí later released the 28-year-old man and a file will be sent to the DPP.
The woman is expected to appear in court this morning in relation to the incident, while the 39-year-old man remains in custody.
Members of the National Drugs Unit, Organised Crime Unit and Revenue Customs Services were involved in the operation.