A senior PSNI officer has denied that intelligence they provided to the Smithwick Tribunal was mischievous or ill-informed.
Assistant Chief Constable Drew Harris's evidence was read into the record at the Smithwick Tribunal.
The Tribunal, which is investigating claims of garda collusion in the murder of two senior RUC officers, had heard his evidence earlier behind closed doors.
The intelligence claimed that a senior PIRA member had several gardaí who passed information to the IRA including those of a senior rank - inspector or above.
ACC Harris confirmed that the PSNI had an ongoing investigation into that allegation.
Other intelligence said that the IRA always got good information from Dundalk Garda Station.
Gardaí had passed information to the IRA which led to the ambush in which Lord Justice and Lady Gibson were killed in 1987.
The intelligence also said "Sinn Féin / PIRA" were concerned about the work of the Tribunal revealing damaging information, particularly about the murder of farmer Tom Oliver who was killed by the IRA.
Relating to former Detective Garda Sergeant Owen Corrigan, one piece of intelligence said he was a "gangster".
It said, he was not involved with the IRA while the other said he was engaged in corrupt activity targeting gangsters and was motivated by greed.
He did pass information to the IRA for reasons of "self preservation" it stated.
Mr Corrigan and the two other former gardai being probed by the Tribunal, Sgt Leo Colton and Sgt Finbarr Hickey, all deny claims of collusion.
This afternoon, the Tribunal heard that ACC Harris denied that the intelligence he had brought could be mischievous or ill informed.
It had been carefully examined beforehand so they could produce it "in good faith", he said.
Under cross examination by Diarmuid McGuinness, counsel for the Garda Commissioner, ACC Harris, said the reason they had not told the gardaí about some of this intelligence before is because they felt it should be shared with the Tribunal first.
Asked if he was aware of the identity of the garda or gardaí, not before the Tribunal, who were alleged to have passed intelligence to the IRA, Mr Harris replied "I cannot assist any further at this time."
The senior PSNI officer was also cross examined by Michael Egan, counsel for Patrick Joseph 'Mooch' Blair.
Mr Blair had previously given evidence to the Tribunal where he was asked about involvement with the Provisional IRA.
Mr Egan wanted to know if the PSNI were "spying" on his client.
ACC Harris replied that the PSNI were engaged in the collection of information to carry forward police activity.
He said he could not comment on what operations may or may not have been in place regarding Mr. Blair.
Mr. Egan asked if his client was still under surveillance to which ACC Harris replied he could neither confirm nor deny that.
He also denied that the PSNI had set out to undermine Mr. Blair or anyone else.
Asked about the source of the information about Mr Blair, Mr Harris said he regretted that he was not in a position to be able to share the providence of the source in the Tribunal.
The witness was also asked if he believed Mr. Blair was engaged in some "nefarious operation" when the ambush of the two senior RUC officers took place, ACC Harris replied "that would be my strong suspicion."
Ms Mary Laverty, counsel for the Tribunal, asked Mr Harris if three pieces of garda intelligence were passed to them which related to claims of garda collusion in the IRA murders of Lord Justice Gibson and his wife as well as Chief Supt Breen and Supt Buchanan.
He said he was not aware that they had.
Judge Smithwick said that the PSNI intelligence would have to be probed and the Tribunal has now adjourned with no date for the resumption of hearings.