The New York Times published an article in which a couple of business associates of Anthony Bosch, the owner of the clinic at the center of the A-Rod PED allegations, express doubts about the whole story.
For example, the Times reports that one of these associates, Jorge Jaen, apparently said "would not be surprised to learn that Bosch had embellished his patient notes to lure an investor to his clinic".
The Times story of course does not prove anything; Bosch's associates could be wrong about him. However, it obviously is important information to anyone interested in gauging whether the allegations are true.
If this is the first time you've read about these doubts, it is because the hack "journalists" who have been having a field day with this scandal have omitted telling you about this part of the story. For example, I checked out the New York Daily News Yankees page, and of course there's not a single article with a headline referring to doubts.
This omission is not surprising. Most members of the Baseball Writers’ Association of America are participants in a journalistic business model that attempts to generate revenue by exploiting scandal. A corollary of this business model is that reporting information that casts doubt on a scandal is merely bad business.