Whomever you heard that from is full of shit. Nobody could possibly know whether any of the finalists other than Ben and D. Williams were on drugs. Most people (the Charlie Francis lemmings) who insisit that all the other finalists were on drugs are simply trying to rationalize Ben's disqualification.
Carl Lewis got popped for a cold medicine positive that was determined to be due to inadvertant use. Pseudoephedrine has since been removed from the banned substance list. Of course, the "all sprinters are on drugs" idiots still eat this up.
I'll leave you with this: if all sprinters are on drugs, then why are only Charlie Francis' athletes (from Ben and Desai in 1988 to Tim and Marion in 2003) getting caught?