Steroids and Palmeiro

With the recent revelation that Rafael Palmeiro has violated the league's steroid policy, I could only think of this statistical analysis from December that we did. It was intended to show how out of whack Barry Bonds' post-34-years-old production was compared to the post-34 production of the greats in baseball. One interesting oddity at the time was that Palmeiro, while not increasing his production at a prodigious rate like Barry, managed to maintain his production at pre-34 levels, which no other historical great could do. At the time I guessed that it was due to good conditioning and playing in a offense-friendly era. Now, of course, I'm not so sure.

Also, what does this do to Jose Canseco's credibility?