Olympic women's shot put champion Nadzeya Ostapchuk has been stripped of the gold medal she won at the London Games a week ago after testing positive for a banned anabolic steroid.
Double Olympic champion Valerie Adams feels the suspension on Russian athletes from the Rio Games is a positive step towards eradicating doping and the New Zealand shot putter has called for a life ban on drug cheats.
New Zealand's Valerie Adams became the first woman to win four successive world titles when she secured shot put gold on Monday.
American Michelle Carter stunned champion Valerie Adams with a throw of 20.63 meters on her final attempt to win Olympic shot put gold and deny the New Zealander a third successive title on Friday.
The International Olympic Committee (IOC) said it had disqualified weightlifting gold medallists Cao Lei (75kg), Chen Xiexia (48 kg) and Liu Chunhong (69kg) from the Beijing Games after they tested positive for prohibited substances.
