An Irish police whistleblower said an unfounded sexual assault allegation "ruined" his life forever.
Sgt Maurice McCabe has accused the Garda force of malpractice including the quashing of penalty points.
The saga surrounding the handling of his claims of wrongdoing among gardai in Cavan-Monaghan contributed to the end of the careers of former Taoiseach Enda Kenny, two former chiefs of the Garda and ex-justice minister Frances Fitzgerald.
A decision was taken not to prosecute him following a false allegation in 2006 while he was an officer in Bailieborough, Co Cavan by a complainant who later confronted him outside the Garda station.
Sgt McCabe said he was 100% exonerated by the Garda investigation.
A letter from the officer said: "I am married with five children and this scurrilous allegation has ruined my life forever.
"I am a completely changed person in that I don't trust anyone any more."
He sought the Director of Public Prosecutions' directions: "All I seek is fairness."
He appeared before a public inquiry at Dublin Castle which considered the handling of the complaint against him.
The Disclosure Tribunal led by Mr Justice Peter Charleton is probing how the Garda handled Sgt McCabe's whistleblowing.
Part of the Tribunal's terms of reference is considering whether the false and unfounded child sex abuse allegation made against Sgt McCabe in 2006 was used against him.