Most anti-fraud professionals who have been in the industry for awhile have at least one case that they will always remember as being the most difficult. The investigator may have faced roadblocks in the form of not having any whistleblowers or tips to go on. The case may have been especially challenging because the victim organization refused to disclose necessary information in order to conduct the investigation. However, it’s unlikely that many fraud examiners have had to face the difficulties inherently present in investigating fraud in an active combat zone.