Editor’s note: This article is the second of a two-part series.

The recent criminal conviction of a cardiologist who, in an effort to get paid for medical reports, falsely certified his patients as so injured by diet drugs that their heart valves were leaking blood, is just the latest case to show that vast pools of money in class action and mass tort litigation can be a catalyst for fraud and other problems. But attorneys say that false claims by plaintiffs, or even claims administrators pocketing funds owed to claimants, are the exception rather than the norm.