Does AGO act on feedback or complaints from the public including whistle-blowing?

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Findings from investigations based on information received from the public are included in the "management letter" issued by AGO to the CEO of the statutory board or the permanent secretary of the ministry as the case may be.
Selected findings are also mentioned in the Report of the Auditor-General which is presented to the President, tabled in Parliament and issued to the media. This usually happens in July of each year.
All information received are considered by AGO. Where there is a prima facie case of irregularities affecting public funds, AGO will carry out an audit investigation. The timing of the investigation would depend on the nature of the case, as well as AGO's audit schedule and resources.
Where necessary, AGO may refer cases to the public agency concerned or the appropriate authority such as the police or the Corrupt Practices Investigation Bureau without disclosing the identity of the informant.