Cycling legend Chris Hoy has hailed drug testing as a positive thing for Olympic sport.
Hoy - Britain's most successful Olympian - believes that drug testing will erase doping athletes and ensure the athletes free of drugs regain credibility.
"Any positive test or issue with drugs is not good for sport obviously," said the six-time Olympic cycling champion.
"It is depressing for the fans because they want to believe that what they are seeing is a true performance. It is depressing for the athletes but it has to be done," Sir Chris added.
In the light of the confirmation this week that two of the world's top sprinters - America's Tyson Gay and Jamaica's Asafa Powell had been tested positive for drugs - Hoy believes this is actually positive news for the sport in the long-term
"In a way it is good news because it shows that if people are cheating then they are going to get caught," stated Hoy.
"You have to think about the athletes who are clean who are competing against people who are not and, for them, they want to know that the playing field was level."
"It is short-term pain and long-term gain in terms of trying to get the cheats out and making sure they have been caught.
"Then you can hopefully see performances that are absolutely 100% genuine."
Powell and Sherone Simpson - along with three others in the Jamaican squad - have all been tested for positive for drugs in the last week. The world's fastest man in history - Usain Bolt - is not one of them though.
Sir Chris was speaking on his return to the Olympic Stadium in Stratford, east London, for the first time since the London 2012 Games where had the perfect ending to his competitive career becoming Britain's most successful Olympic sport star with the two medals secured at the velodrome.
Hoy will be guest of honour at the official starter for the five-mile National Lottery Anniversary Run on July 21 - the first event to be staged at the Olympic Stadium since the 2012 Games last summer.
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