I am left deeply sceptical. On one side, I do not want to believe it and just hope that the top riders are not adding mechanical advantages. But, on the other hand I know what an attraction a win can be for some. We do not have medical doping for nothing. There are some very strong incentives out there.
As raindog has suggested, it is easy to check for and apply (hopefully) simple scrutineering measures. But, a team doing this implicates the whole team; management, riders and mechanics. With medical doping a team can claim to be innocent and state it is simply a rogue rider.