Full survey results: One in 20 amateur racers admit to doping May 04, 2017 Analysing the results of CW’s online poll, we grapple with the implication that one in 20 British amateur riders is a doper One in 20 amateur racers have taken performance-enhancing substances over the course of their racing careers, a survey by Cycling Weekly has found. Tags: Doping General News Share 0 Share on Facebook Tweet Tweet on Twitter +1 +1 on Google Plus