Investigating powerful figures comes with its own risks, but for retired MACC officer Rosli Husain, the job was never about who stood on the other side of an investigation.

For the former lead investigator in MACC's SRC International probe, it was about upholding integrity, doing what was right and carrying out his duties without fear or favour.

In an exclusive interview with Malaysiakini, Rosli (above) said he had always believed in treating everyone fairly, including those under investigation, and that the strength to uphold this principle ultimately came from Allah.

"If we intend to charge someone, we must first assess whether the evidence is sufficient. If further investigations establish that the evidence is insufficient to charge that person, we must be honest and acknowledge that they should not be charged.