Now that Lance Armstrong has admitted what he’d denied for years about being doped, the biggest unanswered question is whether he and the international cycling union (UCI) colluded to cover up a positive drug test that would have gotten him banned.

Though Armstrong told Oprah Winfrey there was no such deal, former teammates Tyler Hamilton and Floyd Landis both testified to the US Anti-Doping Agency that Armstrong gave the federation $125,000 for that purpose.