I'm not Jason, but this is a sport I follow very closely. Lance has never conclusively been proven to have doped, but the circumstantial evidence is not all that different from what it is with Barry Bonds.
Of course, I absolutely can't stand the guy, but that has more to do with the way he disrespected other riders, other people and even some of his own teammates than with doping. God, don't get me started . . .