In 2010, the American Board of Internal Medicine (ABIM) suspended or revoked the certification of 139 physicians for giving away or soliciting examination questions for a board review company.
Residents taking the American Board of Radiology medical physics examination wrote down test questions ("recalls"), and shared them with future examinees. Dermatology residents also reproduced questions ("airplane notes") minutes after the certification examination.
CNN reports on residents preparing for certification examinations using questions reproduced by people who took previous exams:
References: Opinion: When doctors cheat - CNN http://buff.ly/19c2P70