(CNN)Athletes have criticised the US Anti-Doping Agency's (USADA) decision to drop its charges against sprinter Christian Coleman following the advice of the World Anti-Doping Agency (WADA).
Christian Coleman: Athletes criticize 'loophole' after sprinter avoids ban
American Coleman -- the fastest man in the world this year -- had broken anti-doping rules by missing three drug tests in 12 months and was facing an automatic one-year ban.
But his case was dropped on a technicality over dates, sparking some athletes to declare the decision "unreal" and "crazy."
The 23-year-old is now free to compete at the World Athletics Championships which begin in Doha on September 28.
Coleman ran a world-leading time of 9.81 seconds in the Diamond League in California in June -- a time just 0.02 seconds slower than his personal best.
But he fell foul of WADA's "whereabouts" system, which requires athletes to let officials know where they will be for one hour every day, as well as details of overnight accommodation and training venues.
If an athlete fails to do so -- known as a "filing failure" -- three times over a 12-month period, they could face punishment.