The South African Institute for Drug-Free Sport (SAIDS) confirmed today that the 2012 Comrades winner, Ludwick Mamabolo, has tested positive for the banned stimulant methylhexaneamine and could face a two year ban and be stripped of his title if found guilty by an independent tribunal.
Comrades Winner Tests Positive - Runner's World Magazine

This is such a shame. We get a South African back on top of the world's biggest ultra-marathon only for him to be stripped of his win.