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Kenya boxer David Munyasia, who was sent home from the Olympics for a positive dope test, has denied taking any banned substance.
"I am clean. I have never taken qat or any drug. I believe there was a mistake somewhere," Munyasia said after arriving back in Nairobi.
Munyasia said he remembered only taking a coffee, a Red Bull energy drink and an antibiotic.
"I'm innocent of any wrongdoing. These are the only thinngs I've taken."