January 2012: Justice Minister Alan Shatter receives a report detailing allegations of garda misconduct from Sgt Maurice McCabe.
November 28-29, 2012: Media reports first reveal claims that well-known individuals had penalty points cancelled.
December 2012: Under Dail privilege, Independent TDs name judges who had penalty points wiped.
May 2013: Garda internal review leads to disciplinary proceedings for three gardai.
June 2013: Transport Minister Leo Varadkar says he met Sgt McCabe and found him "credible".
September 2013: Comptroller and Auditor General finds significant failings in points system.
December 2013: Sgt McCabe sends Oireachtas Public Accounts Committee box of evidence. Mr Callinan threatens legal action.
January 23, 2014: Mr Callinan appears before the PAC and describes the actions of Sgt McCabe and retired garda John Wilson as "quite disgusting".
January 30, 2014: Sgt McCabe gives evidence in private to the PAC.
February 5, 2014: Independent TD Mick Wallace reads a transcript of conversation between confidential recipient Mr Connolly and Sgt McCabe into the Dail record. Mr Connolly allegedly tells Sgt McCabe that Mr Shatter would "go after" him if his complaint became public knowledge.
February 19, 2014: Mr Connolly is sacked from his position and Mr Shatter announces reforms of whistleblower system.
March 12, 2014: Garda Inspectorate finds widespread breaches of system. Garda Commissioner releases statement clarifying his use of the word "disgusting".
March 20, 2014: Mr Varadkar calls on Mr Callinan to withdraw his "disgusting" remark. Labour ministers back his call.
March 24, 2014: The Government prepares for a crunch Cabinet meeting.
March 25, 2014: Mr Callinan informs Minister for Justice Alan Shatter that he is resigning.