I've heard there are studies out there that "prove" that steroid use does not correlate or cause increased performance. There is also the res ipsa loquitur approach of "the thing speaks for itself" that players getting busted are the ones putting up outstanding performances.
Whatever side you fall on, I need to say this...
- Top 6 single-season Home Run Performances: Bonds, McGwire, Sosa, McGwire, Sosa, Sosa. All either proved, admitted, or super-duper highly suspicious users.
- All-Time Home Run Leader: Barry Bonds. Also in the top 10: McGwire, Sosa, A-Rod...see above.
- Oldest pitcher to win a Cy Young: Roger Clemens...same story. Also #3 all-time in strikeouts.
If you take the "suspect" players off the single-season HR records list, only Babe Ruth (twice) and Willie Mays have hit more than 51 HRs after age 31. That's 3 completely honest performances by guys over 31 out of the top 31 overall. That should make you think that maybe power-hitting after 30 is quite a rare, HOF-worthy feat.