[NFump]

How about this. From the PBUC 6.3: The term "foreign substance" shall include any object, material, or substance that could, in the judgement of the umpires, be used to deface or "doctor" the ball in any manner.

Here's one for debate. If the umps had knowlege that there was something on his hand. They never looked to see what it was. Why not? Did they not want to find out because to do so may have put them into the position of having to kick him out? Did they handle it according to protocol? I certainly don't know the answer to any questions but just want to hear what everybody says. See Rule 8.02(a)(2) through 8.02(a)(6) Comment. I believe that will answer your question.