This horse is barred from running in Cup week after failing a drug test – that its trainer requested

Blinkers On is a weekly column covering the biggest issues of the spring racing carnival. It is the last thing racing needed on the eve of Melbourne Cup week – another group of unsuspecting victims caught up in racing’s breast cancer drug saga . But, here we are again. This time around, up to 50 owners have had their Cup week dreams ruined because their horse Major Share has produced a left-field positive to formestane – a mysterious substance that popped out of nowhere almost four years ago and which has baffled the racing industry ever since.