Why don't promoters/federations use polygarphs like other sports? If you were subjected to one in order to collect your winnings, you might see alot of cleaner riders making more money.
http://www.thefirstpost.co.uk/11162,news-comment,news-politics,lie-detector-nails-olympic-cheats -
http://www.thefirstpost.co.uk/11162,news-comment,news-politics,lie-detector-nails-olympic-cheats -