Husband of top sprinter in drugs row; OLYMPIC GAMES: ALL THE LATEST NEWS AND REPORTS FROM SYDNEY 2000.
In a brief statement the IAAF said Hunter had tested positive for a controlled substance at a meeting in Oslo on July 28 and the case had been passed on to US athletics authorities.
"The case is being referred to US Track and Field (USATF) which will deal with it in accordance with the relevant rules," the IAAF said after a meeting in Sydney with USATF officials.
"I know what's going on and I am aware of the allegations and I am going to defend myself vigorously," Hunter said in a statement broadcast by NBC news.
In a statement read out in Sydney today, USATF said: "USA Track and Field confirms that the IAAF has referred to it an eligibility matter involving an American athlete.
"In accordance with our rules, we will make no further comment and follow all standard procedures for judication."
IAAF general secretary Istvan Gyulai denied allegations the test results had been suppressed and said they had been released in accordance with established procedure.
"There was no cover up," Gyulai told reporters. "The interest of the athlete comes first," he said.
Francois Carrard, a spokesman for the International Olympic Committee, said:
"The CJ Hunter matter is not a concern of the Olympic Games. He is not here. It is a matter for the international federation."