Readers may recall that David Black was a prison officer who was murdered in 2012 when he was machine gunned on the M1.
During the interviews, which the judge previously described as "oppressive, aggressive, hectoring and bullying", Mr Brady allegedly identified Mr McLaughlin as the man who moved a Toyota Camry car, which it is claimed was later used by the gunmen to carry out their ambush.

On Tuesday, Mr Justice Colton said that having read and viewed the video-taped interviews, including evidence of the three police officers who conducted them, he "could not believe that it was contemplated that the interviews with Brady would be relied upon in any criminal prosecution".
https://www.bbc.com/news/uk-northern-ireland-44560519

It seems that the Gardaí did their best to get the accused convicted, up to and including intimidating witnesses.