Former men&rsquo;s world record-holder Asafa Powell and women&rsquo;s Olympic relay gold-medallist Sherone Simpson are among the sprinters who have failed tests in recent months. <img alt="Asafa Powell" src="http://images.mid-day.com/2013/nov/Asafa-Powell.jpg" style="width: 500px; height: 887px;" /> Jamaica&rsquo;s Asafa Powell competes in the men&rsquo;s 100m semi-final of the 2012 London Olympic Games at the Olympic Stadium. Powell failed a dope test earlier this year. Pic/Getty Images Dr Paul Wright, a senior official with the Jamaican Anti-Doping Commission (JADCO), says he fears that a recent visit to Jamaica by the World Anti-Doping Agency (WADA) will reveal that doping practices have become widespread. &ldquo;The results are not good. This year alone the results really point the finger,&rdquo; he said. &ldquo;Remember, all of these results except one were caught by JADCO. The problem is these people were tested positive in competition. What that means is months before, you know the date of the test and the approximate time of the test. This could be the tip of the iceberg to have so many positives coming in competition.&rdquo;u00a0Jamaica&rsquo;s testing procedures were due to be discussed at a WADA executive board meeting in Johannesburg later yesterday.u00a0

Dr Paul Wright, a senior official with the Jamaican Anti-Doping Commission, believes more doping cases will emerge from Jamaica 

Jamaica doping 'tip of iceberg', says tester

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Jamaica doping 'tip of iceberg', says tester

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