UK Sport's anti-doping chief John Scott feels disgraced sprinter Dwain Chambers owes it to athletics to come clean on all he knows about drugs cheats to help others avoid the same mistakes.
Former European 100 metres champion Chambers, 29, has now returned to competitive action following his two-year suspension after testing positive for designer steroid tetrahydrogestrinone (THG) in 2003.
However, despite a successful World Indoor Championships in Valencia earlier this month where he won a silver medal, Chambers remains banned from the British Olympic team - a situation the athlete's legal advisors are currently considering appealing.
While Chambers has publicly stated the reasons he turned to drugs and expressed a willingness to help the anti-doping cause, UK Sport maintain the sprinter has not yet given them chapter and verse on the controversy.
Scott, the organisation's director of drug-free sport, maintains ``feelers'' have been put out to the Chambers camp, but so far no positive feedback has been forthcoming.
"If Dwain is prepared to come forward and work with us, we are happy to do that,'' said Scott at the launch of the UK Sport testing programme ahead of the Beijing Olympics.
"Contrition is good, but we need more than that - particularly from someone who has been convicted of as serious a doping offence as Dwain.
"We certainly don't know who else was also in the know, whether there are people still in the system he worked with who have not been removed from that system.
"We don't know enough about the regime he pursued.
"This is the sort of information which is most valuable if you are trying to drive drugs out of sport.
"Yes, we need people to say 'I am sorry, I made a mistake', but that is not enough if you are expecting full re-integration.''
Scott insisted: "This is about communicating a message and wanting to be part of the solution, rather than an example of the problem.
"That is what I haven't yet seen, a genuine desire to work to be part of the solution rather than just saying 'I got it wrong'.
"We can offer Dwain a chance to help improve the system and stop people making the mistake he made, which if he is truly contrite then surely that is something he would want to do.
"This is about someone accepting they have made a mistake and now wanting to make a difference, not getting something in return. They have already done the damage to the sport.''
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