Zhou Mi: (AP)Former world No. 1 female player Zhou Mi has been banned for two years by the Badminton World Federation after testing positive for clenbuterol.
A urine sample taken from the Hong Kong player in late June tested positive for the drug, the governing body said in a statement on Saturday.
Zhou said she took the drug - used by asthma sufferers or as a weight-loss aid - unknowingly, as it was contained in a Chinese medicine to treat a fever.
Zhou's ban rules her out qualifying for the 2012 London Olympics.