Sean Carraher, aged 55, is accused of posting about 50 messages on the websites Rate-Your-Solicitor and Victims of the Legal Profession alleging that Sergeant Conor Gilmartin was corrupt and had withheld evidence in a previous case involving the accused. He is also accused of making between 10 and 20 calls to Sgt Gilmartin.
When arrested, Mr Carraher accused the sergeant of launching a “vendetta” against him after Mr Carraher made a complaint to the Garda Síochána Ombudsman Commission.
The trial heard no findings of wrongdoing have been made against Sgt Gilmartin.
Mr Carraher, of Stradbrook Hill, Blackrock, has pleaded not guilty at Dublin Circuit Criminal Court to harassing Sgt Gilmartin between March 2009 and May 2011.
James Dwyer, prosecuting, read out interviews with Mr Carraher which were conducted after his arrest in November 2011.
Investigating gardaí put it to Mr Carraher that he was harassing Sgt Gilmartin and causing him distress by accusing him online of being evil and corrupt. They said there was no evidence to support these claims.
“So it’s a crime to expose Garda corruption as far as the gardaí are concerned?” said Mr Carraher.
“He started it, he needs to be exposed for what he is; a corrupt cop.”
He said he was exercising his right to freedom of expression under the European Convention on Human Rights. “I am a whistle-blower exposing Garda corruption. I believe I will be vindicated just like the McBrearty family in Donegal.”
Mr Carraher said he was willing to take a polygraph test and invited Sgt Gilmartin to do the same. “Everything I’ve posted on that web page is 100% correct to the best of my knowledge. He can sue me for libel if he wants.”
Sgt Gilmartin earlier told Damien Colgan, defending, he had sought advice on the matter but that it was pointless to sue because Mr Carraher was “without funds.”
The trial continues.