Doping at the Commonwealth games - Women's 100m in even greater disarray!

http://news.bbc.co.uk/sport2/hi/comm...10/9078690.stm

After Sally Pearson, who won the women's 100m, was disqualified for a false start which was actually attributed to another runner, the new 'winner' has failed a dope test.

(Alarmingly the BBC report says that this is the first negative test of the Commonwealth games. Isn't it supposed to be positive tests which fail? Or are drugs now so rife in sport that this athlete will get disqualified for not taking drugs?)