Johnstone, the filmmaker behind "Rising From Ashes, " recalled how Adrien and his teammates used to shave the bottoms off soccer cleats to make their own bike shoes.

WSJ: Adrien Niyonshuti: A Long, Amazing Ride to the Olympics - Jason Gay

According to the source, the purpose of the probe was not to build a case on whether Armstrong or his teammates used banned substances, but rather to establish evidence beyond a reasonable doubt that Armstrong violated criminal fraud statutes.

CNN: January 19, 2013 -- Updated 0035 GMT (0835 HKT)

In its report, released last week, the anti-doping agency made public testimony from Armstrong's teammates and others who said Armstrong was among team members who used banned performance-enhancing substances and tried to hide it from testing officials.

CNN: STORY HIGHLIGHTS