The Athletics Integrity Unit (AIU) says it won't appeal a decision to clear American sprinter Christian Coleman of a rule violation.
The AIU says it agrees Coleman shouldn't face a ban for missed tests because of a technicality which led the U.S. Anti-Doping Agency to drop its case against him last week.
Coleman is the reigning U.S. champion in the 100 metres and a favourite to win gold at the upcoming world championships.
AIU chairman David Howman says he is following World Anti-Doping Agency (WADA) guidance about how to date Coleman's "whereabouts failures." Athletes can only be punished for racking up three failures in a 12-month period, and WADA said one should be backdated to fall outside that period.
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