Gardai are continuing to question a member of the force and a man in his 30s in connection with drugs related activities in the north-west.
The woman, aged in her early 30s, was detained in Sligo yesterday evening.
It's understood she's based at a Garda station in north Dublin city.
The arrests were made by Gardai in Sligo, assisted by National Support Services and are part of an investigation by the Organised Crime Unit and Sligo gardai into a criminal gang in the northwest.
