Ahead of the 2016 Summer Olympics in Rio de Janeiro, allegations of doping in international sports have been piling up recently, including failed retests and reports of systemic cheating that have cast a dark shadow over the 2014 Games in Sochi, Russia, and the 2008 games in Beijing. And with the International Olympic Committee (IOC) going back and looking again at samples from the 2012 London Games, this could merely be the beginning.
