Amazon's ebooks only work on amazon hardware.
Not entirely accurate--one of the things I like best about ebooks from Amazon is that I can (and do) read them on the Kindle, my phones, and my computers. The Kindle app is available for just about everything, and syncs between devices so I can pick up on one where I left off on another.
That assumes that the test doesn't have a systematic error. If you are systematically biasing the results (and in the case of the lab that did the Tour de France testing, since their procedures and logs aren't published, we'll never know if they are biasing the results), any number of positives is no more remarkable than 1.
So you think that money is the root of all evil. Have you ever asked what is the root of money? -- Ayn Rand