The Wall Street Journal's Health Blog speaks with John Dahlberg, who is the director of the Division of Investigative Oversight in the Office of Research Integrity at HHS, about scientific fraud. Dahlberg says that fraud cases are rare and when they do occur it's often a grad student or a postdoc succumbing to pressure, either from a PI or self-imposed. If the damage is serious, Dahlberg says "we'll recommend voluntary exclusion. It's like a disbarment.