Michale Johnson, one of the greatest stars in athletics history, said that doping can never be eradicated.
Johnson, who won nine world champions and five Olympic gold medals, said when asked by local media whether doping can be got rid of from the sport: "No, because people will always cheat. To eradicate doping would be like readicating crime from society.
"You always have to have law enforcement and a judicial system and you have to try to stay one step ahead of the criminals. It's always going to be that way in sports, not just track and field."
Johnson, who still holds the men's 200m and 400m world records, added: "You're never going to have people not cheating anymore, they're always going to try. You always have to have antidoping agencies, you have to have drug testing to try to stay ahead of the people who cheat so you can catch those people and get them out of the sport, just like in society you have to catch the criminals and get them out of society."
The American reitired from track after the 2000 Sydney Olympic Games. He is now an agent representing a small group of athletes. He is also a TV commentator and developing a business of training centers.