Lance had an opportunity to test the evidence in arbitration, but took his ball and went home.
I think Lance's team decided that they had a better chance "trying the case in the court of public opinion" rather than going to arbitration. We're about to see how that works out for them. It seems to me the best path would have been to confess outright and ask for forgiveness. That seems to have worked out for others but perhaps none with the star power of Armstrong.
Bruyneel is still going to arbitration, so we'll also get to see a legal verdict, at least so far as his involvement in the alleged conspiracy.