It's set off an international war of words between the Chinese and the US over drug use accusations.
But the performances of the Chinese might actually have more to do with Aussie coaching than with banned substances.
More Olympics stories from Today Tonight- Romance in the air at London 2012
- Emily Seebohm's proud mum
- James Magnussen Shattered
- London's super swimsuit ban
- Drug cheat crackdown at London Olympics
- London amps up security for Olympic Games
More stories from reporter Laura Sparkes
London Olympics 2012: Ye faces doping questions after second gold medal
This reporter is on Twitter at @LauraSparkes7

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