In a television interview in America, the US Anti-Doping Agency chief Travis Tygart has described the sophistication of the Lance Armstrong doping scandal, which included the use of an untraceable mobile, makeup to hide needle marks, and an offer of a near 300,000 dollar donation from one of Armstrong's representatives to the agency in 2004.
Tygart says he spent years probing the biggest doping scheme in sports history, and received death threats.
An investigation into the scheme resulted in the disgraced American cyclist being stripped of his seven Tour de France titles and banned from the sport for life.
Tygart says Armstrong had been tipped off by Swiss drug testing laboratory director Martial Saugy about how to beat the erythropoietin test in 2002 after one of Armstrong's samples from the 2001 Tour of Switzerland was described as suspicious.
Tygart says Saugy told him there were samples from Lance Armstrong that indicated EPO use, and nodded his head when he asked him if he gave Armstrong and his then manager Johan Bruyneel the keys to defeat the EPO test.