Lance Armstrong says the authorities of cycling and other endurance sports were powerless to stop doping in the 1990s.
The American was banned for life and stripped of his seven Tour de France titles by the United States Anti-Doping Agency last year over drug use.
He said: "They could not do a thing - like the head of the IAAF (athletics) couldn't do a thing, and the head of FINA (swimming) couldn't do a thing.
"They just did not have the tools to do anything until maybe 10 years later."
In an interview with American chat show host Oprah Winfrey in January this year, Armstrong admitted his central involvement in a sophisticated doping conspiracy.
He took the banned performance-enhancing substance EPO (erythropoietin), which was undetectable until a test became available in 2000.
During the first part of an interview with Cycling News, Armstrong explained the circumstances behind his decision to use more serious substances.
"We rode in 1994 and we didn't move into high-octane. We just suffered through the year," he said.
"In '95, we just decided to make that next step. It's not my style to name names. There were certainly as a whole us American guys, to generalise that group, who made that decision together.
"Perhaps there were people on the team, older riders who we knew had done that, and there were others - we had to have help from the team doctor - but these are all people who have avoided any consequences. Totally."