He said more than 4,500 tests would be carried out in Beijing, including a new and improved test for the once-undetectable human growth hormone (HGH).
"I was impressed with the state of readiness (in Beijing), I certainly detected a level of expertise that can deal with whatever they have to deal with over the course of the games," he said.
"There will be more tests this time than ever before and I think I can be very confident as WADA has evolved and got better in its expertise in the past eight years or so there will be a much more effective outcome in dealing with anyone who seeks to cheat.
"In the battle with the scientists, there's little doubt that the scientists who are actually working for the white knights are getting better all the time and countering the scientists who are working with the other side.
"There were certain years with certain drugs that allowed athletes to believe that if they cut it out in the days leading up to the games they could get away with it.
"They should not be sure of that anymore. We are better now at detecting over longer periods."
