“[ACFE] data indicates that hotlines are a very effective fraud detection tool. Occupational frauds are much more likely to be detected by tips [i.e. hotlines] than by audits, controls or any other means…
Hotlines were associated with the greatest reduction [up to 67%] in median losses for private companies (and not-for-profit organizations).”

Report to the Nation, 2008 – The Association of Certified Fraud Examiners, www.acfe.com