US Track and Field chief executive officer Craig Masback has expressed his disappointment in Justin Gatlin after the world and Olympic 100 metres champion was banned for a maximum of eight years after admitting his positive test “constituted a doping violation”.

Former world record holder Tim Montgomery has been stripped of his American 100 metres record following his two-year drug suspension handed down by the Court of Arbitration.

HISTORICALLY a meeting with the sparkle and tension of the Olympic Games, this year's US trials, starting today, are a test not only of America's best but of the sport itself.

American athletics chiefs admit they are in a Catch 22 situation after announcing a "Zero Tolerance" campaign against drugs abuse in the sport.