A year-long Serious Fraud Office inquiry into the Far North District Council found some councillors and staff failed to follow rules governing the approval of projects and use of ratepayers' money, but insufficient evidence to lay criminal charges against anyone.
But exactly what the SFO was looking into and who was at fault may never be known, with the office and FNDC Mayor John Carter unable to discuss the matter further due to restrictions under the SFO Act.
The SFO was called in by Mr Carter following an internal inquiry to investigate activities of concern between 2009 and 2013, when Wayne Brown was mayor.
An investigation was launched in May 2014.
SFO director Julie Read said yesterday there was insufficient evidence to commence a criminal prosecution for serious or complex fraud against any person.