Almost two decades ago, Dr. Lars Aanning sat on the witness stand in a medical malpractice trial and faced a dilemma.
The South Dakota surgeon had been called to vouch for the expertise of one of his partners whose patient had suffered a stroke and permanent disability after an operation. The problem was that Aanning had, in his own mind, questioned his colleague's skill. His partner's patients had suffered injuries related to his procedures. But Aanning understood why his partner's attorney had called him as a witness: Doctors don't squeal on doctors.