Twelve video recordings made during the questioning of a suspect in Carrick-on-Shannon Garda Station six-years ago are being played during a high-profile hearing at Belfast's Crown Court.
During some of the evidence, gardaí are heard using language peppered with curses as they seek to establish possible links to the murder of a prison officer in Northern Ireland by dissident republicans.
At Laganside Court in Belfast, Mr Justice Adrian Colton is being asked to consider whether the video recordings, made by gardaí in Co Leitrim, can form part of the Crown Case against 41-year-old Damien McLaughlin, from Kilmascally Road in Dungannon.
Mr McLaughlin denies aiding and abetting the murder of prison officer David Black in Northern Ireland six years ago, and possessing the car used by the gunmen.
Leitrim-based gardaí arrested a local man, Stephen Brady, in November 2012.
They were seeking to establish if he had any links with Mr McLaughlin.
Over a number of days, the video recordings of the questioning of Mr Brady in Carrick-on-Shannon have been played in Laganside Court.
At one point, a Garda officer asks "that's f-in Damien McLaughlin, is that f-in correct?"
In a section of video seen in court today, Mr Brady was asked a number of times about help he gave to Mr McLaughlin to start a car.
He repeatedly told gardaí he was not a member of the IRA.
The hearing continues.