What potential signs and red flags would you be looking for and how would you counter them from a targeted risk assessment point of view?

There have been numerous failures to detect fraud, abuse and violations of ethics. In June 2006 a Royal Bank of Scotland employee, Donald MacKenzie, was found to have stolen £21 million. Describe how the fraud was carried out and how it was concealed. What potential signs and red flags would you be looking for and how would you counter them from a targeted risk assessment point of view?

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