Leonard may have voiced what many are thinking, but he's finding it awfully lonely.
"We need to get real here," International Olympic Committee spokesman Mark Adams said. "These are the world's best athletes competing at the very highest level. We've seen all sorts of records broken already all over the place."
Adams said the top five athletes in each event, plus two others, are tested as part of "a very, very strong drug-testing program, and we are very confident if there are cheats we will catch them."
"We can't stop speculation. It is inevitably a sad result of the fact that there are people who dope and who cheat," Adams said. "It's very sad we can't applaud a great performance. Let's give the benefit of the doubt to the athletes."
American swimmer Michael Phelps' coach Bob Bowman said he saw no reason for the suspicion and speculation.
"I don't think that 4:28 is an impossible time in the 400 IM, I think it's a perfectly logical time for someone to go," said Bob Bowman, American swimmer Michael Phelps' coach. "I trust the testing service and I know that Michael was tested nonstop and we're very careful about what goes into his body, and I assume that other competitors are, too."
Former Olympic champ Ian Thorpe is among those who say her speed spurt is reasonable.
"You know when I was a 15-year-old I swum 3.46 to win the world championships the following year as a 16-year-old I broke the world record at 3.41 that's a five-second dropoff," he said.
The Associated Press contributed to this report.