Timeline of a political downfall
January 2012: Justice Minister Alan Shatter receives a report from Garda Confidential Recipient Oliver Connolly detailing allegations of garda misconduct made by Sergeant Maurice McCabe.
November 28-29, 2012: A series of articles in the Irish Independent reveals claims that well-known individuals, including a sports star and judges, had their penalty points cancelled.
May 2013: A garda internal review of the points system leads to disciplinary proceedings for three gardai, and changes to the system. Mr Shatter discloses on RTE's 'Prime Time' that Independent TD Mick Wallace had been cautioned for using his mobile phone while driving.
June 2013: Transport Minister Leo Varadkar describes Sgt McCabe as credible and called for a GSOC inquiry into penalty points.
September 2013: The Comptroller and Auditor General finds significant failings in the penalty points system.
November 2013: Garda Commissioner Martin Callinan puts an end to the practice of phone calls being routinely recorded at garda stations.
January 30, 2014: Sgt McCabe defies Mr Shatter and Mr Callinan by giving evidence at the Dail's Public Accounts Committee. Mr Shatter refers the penalty points issue to GSOC.
February 5, 2014: Mr Wallace reads a transcript of a conversation between Mr Connolly and Sgt McCabe into the Dail record. In it, Mr Connolly tells Sgt McCabe that Mr Shatter might "go after" him.
February 9, 2014: It emerges GSOC believes there may have been an attempt to bug its headquarters in Dublin.
February 11, 2014: Mr Shatter tells the Dail no evidence of bugging existed.
February 19, 2014: Mr Connolly is sacked and Mr Shatter announces reforms of whistleblower system.
February 28, 2014: Department of Justice officials are made aware of the existence of the garda station phone recordings by Mr Callinan's office.
March 10, 2014: Mr Callinan writes to the department with further details of the tapes, but the letter did not go to Mr Shatter.
March 12, 2014: The Garda Inspectorate finds widespread breaches of penalty points system.
March 25, 2014: Mr Callinan resigns and the garda taping controversy becomes public knowledge.
March 26, 2014: Mr Shatter denies he had any knowledge of the phone tapes controversy until the previous day. He apologises to the garda whistleblowers for claiming they had not co-operated with an internal garda inquiry.
May 6, 2014: Data Commissioner Billy Hawkes finds Mr Shatter broke the law by disclosing personal information about Mr Wallace's mobile phone incident. The same day, barrister Sean Guerin delivers his report on Sgt McCabe's allegations to Government. He recommends the setting up of a statutory inquiry.
May 7: Mr Shatter resigns.