Champions shouldn't back down from challengers regardless of drug test

There’s kind of that unwritten rule in combat sports that a world champion should be ready to defend their title against all challengers.

So it’s been a surprise to many fans that UFC women’s featherweight titleholder Germaine de Randamie has refused to defend her belt against prospective challenger Cris “Cyborg” Justino.

In an interview with ESPN, De Randamie’s manager, Brian Butler, explained that the champion will not fight Justino because the latter’s past drug test failures.

In 2011, when she fought for the Strikeforce promotion, Justino tested positive for steroids following a featherwei...