The Garda tonight launched a criminal investigation into two detectives declared discredited witnesses by the judge at the trail of Colm Murphy.
The move follows the discovery during the proceedings that interview notes prepared by the two officers had been falsified.
Mr Justice Robert Barr, who presided over the Murphy trial, ruled that the evidence presented by the detectives was "entirely inadmissible".
The finding prompted a post-trial statement from the Irish Council for Civil Liberties claiming the Garda had been damaged by the case.
Soon after court delivered its verdict, a brief Garda statement said an investigation had been launched into the activities of certain officers.
The inquiry will be headed by Detective Superintendent Cormac Gordon, and on its completion a file will be submitted to Irish Director of Public Prosecutions for a decision on possible charges.
In his 75-minute long verdict, Mr Justice Barr made it clear that while the evidence of the detectives involved was regarded as discredited, it had not affected evidence from any other police officers in Murphy's trial.
But sources in Dublin said the controversy over a falsified interview had marred an otherwise good day for the Garda.
PA