A garda conducting a review of intelligence files following allegations of collusion was given only one name to look out for, a detective sergeant the Smithwick Tribunal is also investigating.
The revelation was made today at the Tribunal by Sgt Lionel Mullally.
He worked in the Crime & Security branch of Garda Headquarters at the time an investigation was launched into allegations of collusion.
The investigation was launched following claims in a book and in a newspaper article.
They stated that a garda in Dundalk phoned a person in the IRA passing information, leading to the deaths of Chief Supt Harry Breen and Supt Bob Buchanan in March 1989, just minutes after leaving a meeting in the garda station.
Today, Sgt Mullally said he manually went through the files as part of an internal review ordered in 2000.
He said the name of Owen Corrigan was mentioned to him as part of his investigation by the Det Insp who had told him to carry out the search.
The witness said he was not given any other names of gardaí to watch out for.
The tribunal is focussing on the role of three former garda, Det Sgt Corrigan and sergeants Leo Colton and Finbarr Hickey, and whether they may have colluded with the IRA. All three deny the allegations.
Earlier, the tribunal was told there was a piece of garda intelligence relating to Mr Corrigan that was too sensitive to mention in detail.
Det Supt Peter Kirwan said there was an intelligence report from June 1991 which discussed inappropriate contacts between Mr Corrigan and a car repair shop owner who had a previous conviction in relation to an IRA arms dump.
However, the witness said there was an earlier intelligence report which counterbalanced that, but it was extremely sensitive.
Senior Counsel for the tribunal, Justin Dillon, said that information contained in that report was so sensitive it was not possible to summarise it and present that summary to the tribunal.
Judge Smithwick, he said, was aware of the contents of the report.
