Neil Black, performance director at UK Athletics, says his sport is "stunned" by the news that the American sprinter Tyson Gay has failed a drugs test.
"The starting point was shock and amazement - how can this be?" he said.
"Then you rapidly go through to the tragedy, the shock to the sport, the disappointment, the fact that it doesn't do the sport any good whatsoever."
"It just triggers off to think if it is possible to be even more diligent in our awareness, if it is possible for us to remind athletes of their responsibility and accountability for all these things."