. >> reporter: film maker and amateur cyclist brian fogle said he initially set out to understand howance armstrong had managed to get clean drug tests for years, despite his doping. >> going to do an injection. exciting. >> reporter: so fogle decided to make himself the guinea pig. see if he could pass the drug test. >> i was very interested to see if it was still possible to evade detection. >> reporter: for help with his project, he was referred to dr. gregory ro chenca. explosive revelations. >> it's worse than we thought. >> reporter: at what point did you know that your story's way bigger. >> putin appears on state television, and not only does he deny everything. he says that there was no state-sponsored doping in russia. and about 12 hours after that statement, gregory is on call to me, and he has two kgb agents living in his home protecting him, and he tells me that they're going to kill him. >> reporter: fogle says immediately bought him a flight out of moscow to the u.s. he said he brought something with him, a hard drive filled with documents, detailing russia's doping pro