The Anti-doping program at the 2016 Rio Olympics had a number of serious failings according to a report by the World Anti-doping Agency or WADA.
WADA said several athletes earmarked for testing in Rio simply could not be found while there was little or no in-competition blood testing done in many high-risk sports at the Games.
Many of the problems stemmed from staffing issues, resource constraints, other logistical difficulties and there was also an apparent breakdown in the transfer of knowledge from previous Games.
Many athletes targeted for testing in the Athletes Village simply could not be found and the mission had to be stopped on some days, up to 50 percent of planned target tests were aborted.
Team Chair Jonathan Taylor said the anti-doping program in Rio was able to achieve a number of positive outcomes in the face of very challenging circumstances.