Sounds like MLB and the players union are trying to make this rumor go away:
http://www.azcentral.com/arizonarepublic/sports/articles/0811bbreport0811.html
Baseball, union try to quash rumors of more failed steroids tests
"Faced with a swell that was becoming a storm, Major League Baseball and the Major League Baseball Players Association took what they called an "unusual step" - the sides issued a joint statement Wednesday, with hopes it would quash the rampant speculation.
Reports of large numbers of positive tests currently unreported are totally false. Reports of big-name players having the reporting of their test results delayed are totally false," it said.
"All drug-testing results are processed in precisely the same manner, and without regard to the identity of any player or to the volume of positives at any given time. These media reports and rumors are totally, and completely inaccurate, and do not deserve further comment," it said.
The statement was issued by Rob Manfred, executive vice president for labor relations in the commissioner's office, and Gene Orza, the chief operating officer of the union."