I never took Andro but creatine worked. In '98 I was a 35 y/o softball player. I made stupid muscle/strength gains on creatine over the next couple of months. If Bud put one ounce of research into creatine, he'd know people, especially elite level athletes, could make huge gains using it. When something is legal, it's legal. Coca-cola had cocaine in it back in the day. There was no reason for Bud to go on a PED witchhunt because a big player had creatine in full view in his locker.
Now, if you want to say "He SHOULD have dug deeper", you'd have an argument. I'd say "Why? Baseball was recovering and it's biggest players were using legal supplements. There was no reason to go on a witch hunt." But you could easily counter "Something didn't seem right" and we'd go back and forth.
So you argument shouldn't be "he knew" or "he ignored", it should be "he didn't do his job to the full extent."
That said, I have no issue with PED so I know my viewpoint is a bit different.