The Guardian,https://www.theguardian.com/news/2018/jun/28/how-to-get-away-with-financial-fraud, points out that the number one way in which fraud goes undetected as if it is systemic over a period of time rather than a singular expensive one time exploitation. Most of that kind of fraud is of the white-collar nature which often is more difficult to detect.

Please give examples of this?