31 December 2012 Last updated at 23:59 GMT

Olympic Moments: Johnson drug scandal rocks Seoul 1988

Disgraced Olympic sprinter Ben Johnson

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Canadian sprinter Ben Johnson is stripped of the 100m title at the 1988 Seoul Olympics having tested positive for anabolic steroids.

Three days after beating American Carl Lewis in a world record 9.79 seconds, it was announced that Johnson had failed a doping test.

The athlete left the Games in disgrace and admitted the offence a year later at a Canadian government investigation.

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