Dr. Lars Aanning, seen at his home outside Yankton, S.D., said he lied to protect a colleague in a malpractice case. Now, Aanning is a patient safety advocate.
Jay Pickthorn/AP for ProPublica
Alana and Troy Pack died in 2003 when a woman abusing pain pills hit the children with her car. The accident has led to a ballot measure that, among other things, would put new constraints on physicians.
Courtesy of the Pack family