sample B is positive:

http://www.velonews.com/news/fea/10646.0.html

http://www.washingtonpost.com/wp-dyn/content/article/2006/08/05/
AR2006080500248.html

http://www.nytimes.com/2006/08/05/sports/05cnd-landis.ready.html?
hp&ex=1154836800&en=768b73ef1c6cfb5c&ei=5094&partner=homepage

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