Ah, steroids and baseball. Is there anything more American? With 750 players on active rosters at any given time in 2003, and Alex Rodriguez now "out of the closet," so to speak, this begs the question: Who are the other 103 players who tested positive in 2003?
The reality of the situation is that there is no way Major League Baseball was/is testing for all possible performance enhancing drugs. There's something new and undetectable being put out there every six months or so that makes the stuff that came before look as warm and safe and fuzzy as Flintstone vitamins. The proportion of "enhanced" players to clean ones is probably more like 1 in 3 realistically, if not more.
The fact is that any way you slice it, there are probably still tons of performance enhancing drug abusers in Major League Baseball. I personally think we should have a "clean" league, and a much more highly entertaining "take whatever you want" league.
It's a much better idea than this 'grey' league, in which we don't know where anyone stands, and the people in charge kinda-sorta-maybe would like to stop the steroid use. I personally would like to see a player break 100 home runs in a season and a pitcher not give up a single earned run with over 200 innings pitched. That's just good television.
Anyway, I've composed a slide show of people who had significant drop-offs between 2003 and 2004, or 2004 and 2005, when Major League Baseball had teeth inserted into it's lackluster steroid policy. Enjoy.