Sebastian Coe wants four-year ban for failed drugs tests
London 2012 chairman Sebastian Coe wants the ban for failing a drugs test to be increased from two to four years.
The double Olympic champion's claim comes after sprinters Tyson Gay and Asafa Powell provided positive samples.
"We have to go back from two years to four years. The move down to two did a lot of damage to my sport," Lord Coe told BBC Radio 5 live's Sportsweek.
"It is for the clean athletes. I don't care about the cheats we weed out. These people are trashing my sport."
While the 1500m gold medallist from Moscow 1980 and Los Angeles 1984 does not believe trust in the sport has completely evaporated, Lord Coe is concerned people are losing faith in athletics.
"It is depressing. Trust sits at the heart of this," said Lord Coe, who is also vice-president of the International Association of Athletics Federations (IAAF).
"I don't think trust is gone entirely, but it was a bad day for the sport. The big challenge here is to go on fighting, this is not a fight we can afford to lose.
"It is about trust. If fans can't trust the athletes and go there knowing what they are watching is questionable, then we will descend to American wrestling where most of the crowd know it is fake and, worryingly, don't care."
Seb Coe timeline
1956: Born in Chiswick, London
1980: Wins 1500m gold at Moscow Olympics
1984: Successfully defends Olympic 1500m title in Los Angeles
1992-97: Serves as a Conservative MP
2000: Becomes a life peer
2005: Leads London's successful bid to win 2012 Olympics
2005-12: Heads organising committee that delivers successful London 2012 Olympics
2012: Elected chairman of the British Olympic Association
Lord Coe believes that athletes are currently taking risks by cheating as the two-year ban does not take enough time out of their career to be a deterrent.
But the London 2012 organiser and current British Olympic Association chairman knows that lifetime bans are not possible.
The BOA, before Coe was elected chairman, had a policy of banning any British athletes from competing in Olympic Games for life if they had previously failed a drugs test.
However, in April 2012 the governing body lost its battle with the World Anti-Doping Agency (Wada) at the Court of Arbitration for Sport (Cas) to keep the policy.
It allowed athletes such as Dwain Chambers, who failed a drugs test in 2003, to compete at London 2012.
"If I could bring lifetime bans in I would," said Lord Coe.
"The legal inhibitor to be able to do that is profound. We are not going to be able to have life bans, they would be challenged and when we have done it we have lost.
"Four years does make people think, it is a big chunk of your career but two years with appeals is often only 18 months. Too many athletes have been prepared to take the risk."
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