Lance Armstrong's doping denials through the years

"CBS's reporting on this subject has been replete with broken promises, false assurances and selective reliance on witnesses upon whom no reputable journalist would rely." -- Armstrong statement released on his publicist's website in response to the doping allegations made on "60 Minutes" by fellow cyclists Tyler Hamilton and George Hincapie in 2011.

Photo: An excerpt from the 2011 "60 Minutes" story in which former teammate Tyler Hamilton breaks his silence on Lance Armstrong's alleged use of performance-enhancing drugs.