Don Catlin

Don Catlin, the certifier of Armstrong's cleanliness

Don Catlin, the certifier of Armstrong's cleanlinessMelbourne/Adelaide  - Don Catlin was the man who revealed the secrets of THG and darbepoetin, a variant of EPO. However, at age 70, he suddenly became popular in recent weeks as the man chosen by cycling hero Lance Armstrong to certify that he is clean.

Three-and-a-half years after he retired - after winning his seventh consecutive Tour de France - the US cyclist, 37, returned to racing last week at the Tour Down Under.