In 2002 Bonds' slugging percentage was .862, the highest ever.
I agree with Al that it's going to be really tough to sort this all out. There are guys who definitely were clean, guys who said they were clean but are lying, and guys who admit that they took steroids. How does one assess all these records given this mishmash of information?
Frankly, if you take away 20% of all of Bonds' career totals, assuming that roughly equals the advantage he had while using steroids, he still has enough numbers to make the Hall of Fame.
The whole thing is a mess, and I have no idea how any determination of what counts and what shouldn't will ever be made.
And for the record, Tim Raines was one of the great players of the 1980's and one of the greatest base stealers of all time. He claimed he used to play with a vial of cocaine in the back pocket of his uniform pants. Do we delete all of his records from the record book?