A reporter I respect who rarely covers the Panthers went into the locker room one afternoon and said he could tell me which players use steroids.
I told him he was wrong, and that he was crazy, and on that day he was both.
But when an athlete in a team sport gets caught using a banned substance the more cynical among us are willing to believe that everybody does.
I have no idea how common performance enhancing drugs are in football, basketball or Major League Baseball.
They appear to be more common on Bay Area baseball teams than anywhere else.
Last week Melky Cabrera of San Francisco, an all-star outfielder whose career appeared to fade years ago, was caught cheating. Now Oakland pitcher Bartolo Colon has been. Colon, 39, didn't play last season because of an injured elbow.
The problem now is that every veteran who has a good season becomes a suspect.
Is Derek Jeter enjoying a resurgance because he has one final good year in him or because he's using?
I vote for the former.
I might be naive but I refuse to believe that everybody who attains success or enjoys a comeback or is in incredible condition somehow cheated to get there.
Even if he plays in, or around, San Francisco.