World 100m champion Christian Coleman has been provisionally suspended after missing a third doping test.
The American, 24, has disputed the third whereabouts failure, on 9 December, which has been confirmed by the Athletics Integrity Unit (AIU).
He claims he was Christmas shopping “five minutes away” from home and the tester made no effort to contact him.
“I have never and will never use performance enhancing supplements or drugs,” Coleman posted on social media.
“I am willing to take a drug test every single day for the rest of my career for all I care to prove my innocence.
“I have nothing to hide but it’s not possible to show that if I’m not even given a chance to.”
Coleman says he has been contacted by phone “literally every other time” he has been tested, and claimed the AIU tester wrote an incorrect address on his unsuccessful attempt form.
The AIU does not regard Coleman’s explanation for the missing test as a defence, as it is not their policy to call an athlete if they’re not at the designated address.