Ever since Ben Johnson stormed to a drug-fuelled success in Seoul in 1988, worries over the use of illegal substances have become part and parcel of the Olympics.

Recent scandals involving a number of athletes associated with banned steroid THG have only increased concerns.

Many have been banned after testing positive for THG, including British sprinter Dwain Chambers.

Other top athletes have not tested positive, but suspicion still surrounds them as they work hard to clear their names.

As the drugs become more sophisticated, so do the tests designed to catch those using them. Source.

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