World champion sprinter Christian Coleman is set to miss next year's Tokyo Olympics after being banned from athletics for two years for anti-doping violations, the Athletics Integrity Unit (AIU) announced on Tuesday.
The 24-year-old has 30 days to appeal the decision at the Court of Arbitration for Sport.
To prove an anti-doping violation, an athlete has to have committed three whereabouts failures within 12 months.
But now the missed test on December 9, 2019, added to the two failures in January and April, have seen Coleman suspended.
Coleman said testers had visited when he was out shopping for Christmas presents nearby, verifiable by bank statements and receipts.
"I was only made aware of this attempted drug test the next day on December 10th, 2019 by the AIU when I got this failed attempt report out of nowhere."
"I've been contacted by phone literally every other time I've been tested," Coleman said. "Literally. (I don't know) why this time was different. He even said he couldn't hear the doorbell so why wouldn't you call me?"
He also posted the best 100m time last year -- the 9.76sec he ran to win the world title.