The Disclosures Tribunal has found that Sgt Maurice McCabe was "repulsively denigrated for being no more than a good citizen and police officer".
The tribunal, which is chaired by Justice Peter Charleton, has published its third interim report.
It follows hearings investigating whether there was a smear campaign orchestrated by Garda management against the Garda whistleblower.
The report strongly criticises former Garda Press Officer Dave Taylor for 'disgraceful behaviour', describing him as a witness "whose credibility was completely undermined by his own bitterness".
Peter Charleton also concluded that Superintendent Taylor completely understated his own involvement in a campaign of calumny against Maurice McCabe and that it was NOT the case that he acted under orders.
*****File image: Sgt. Maurice McCabe at Dublin Castle, attending the Disclosures Tribunal/RollingNews.