Mechanical Doping

There’s a video circulating on YouTube suggesting that Fabian Cancellara has been doping in a different way.  It suggests that he has a special button on his handlebars that he pushes to start and stop a small motor that is inside the down tube. The video suggests that his bursts of speed and ability to ride away from his competitors is due to help from this motor.  The video shows how it fits unseen inside the bike.  He has said that these claims are ridiculous.  Here’s a link to the video http://www.youtube.com/watch?v=8Nd13ARuvVE