Can we trust the Paris Olympics will be clean?

The Paris Olympics start in just a few weeks and sport lovers want to know that all the athletes are competing without drug enhancement.  There’ll be a strict testing regime in place, but a dispute has been bubbling away between anti-doping agencies about the handling of 23 Chinese swimmers who returned positive tests three years ago. Today, sport integrity expert Catherine Ordway on whether we can trust that the athletes we see at the Olympic Games are clean. Featured:  Catherine Ordway, Sport Integrity Research Lead at the University of Canberra