The investigation triggered by a whistleblower involves three investigators and the original whistleblower who is prepared to confirm the reports she made and provide supporting documentary evidence.
“"The Commissioners will actually hear evidence from four witnesses. Three witnesses cover the same issues but they play different roles. ... The investigations were triggered by a whistle-blower... The original whistle-blower is prepared to testify to confirm the correctness of the reports she had made to the investigators, and any documentary evidence she may have given in support of her report."”