World anti-doping chief Dick Pound has launched a stinging attack on US athletics bosses over the recent doping scandals to hit the American team.
Pound said USA Track and Field must shoulder the blame for a string of positive tests and investigations.
"The leadership within USA Track and Field has been largely responsible for this problem getting as extensive as it has," he added.
"They are going to have to look very carefully at their own house."
Pound confirmed there would be a test for human growth hormone (HGH) at the Athens Olympics, which start on Friday.
He pledged doping controls would be tighter than ever before, with the number of tests increasing by 25% from the Sydney figures four years ago
http://news.bbc.co.uk/sport2/hi/olym...04/3558000.stm