This is a little suspect if you ask me. There is no doubt in my mind that there is a huge steroid problem in MLB, but I fail to see how the balls could be altered in such a way.
Rawlings is not going to "secretly" manufacture a bunch of balls that will perform better and even if they did, how would they ensure that guys like McGwire and Bonds would be hitting them. If you pay attention to a baseball game, you will notice that the "playing time" of an individual ball is very short; so, if these balls were made, there should be a bunch of them out there that could be cut open and examined.
It would have to be different construction for all the balls.
John McCain would be just the guy to check this out...but not within 90 days of any actual baseball game.
McCain/Feingold CBR 2007 - Core Baseball Reform of 2007