<p>There is no greater sporting fall from grace than that of an Olympic ‘legend’ getting busted for doping offences.<br><br>Who can forget the image of muscle-straining Canadian sprinter Ben Johnson crossing the 100m finish line in 1988, finger pointing to the sky and his eyes an odd, yellowish colour?<br><br>Three days later, he was the most famous drug cheat in history.<br><br>But Johnson is by no means the only one. Here are some of the biggest dopers in Olympic history.</p>
