"We had no idea that he had a problem, he was his usual friendly, outgoing self in London," AOC spokesman Mike Tancred told The Associated Press on Saturday. "He went out and supported all his teammates, was happy and chatty, the usual Matty.
"We did know that before the Games he had a horrendous run with injuries, but we were not aware of any issues with drugs. But we think that it is sad that such a talented athlete has been caught up with such a hideous drug, and we are glad to hear that he is on top of it."
The AOC adopted a resolution Friday that will require all future Australian Olympians to declare any past use of performance-enhancing drugs. Tancred said Mitcham's use of recreational drugs, even serious ones such as crystal meth, would not be in that category.
''It would fall under recreational drug use," said Tancred. "This drug is a performance ruiner, not enhancer."