Kenny Rogers says his hand was dirty:

Rogers's version went like this: "It was a big clump of dirt, and I wiped it off. I didn't know it was there and they told me and I took it off, and it wasn't a big deal. It's dirt and resin and all that stuff put together. When it's moist, you're going to rub up the baseball and it was left on my hand when I rubbed them up."

Rogers denied the umpires said anything to him about the substance. He said, "I saw it and I went and wiped it off and then it was gone. I didn't think it was an issue."

The umps seemed to agree:

MLB umpiring supervisor Steve Palermo said, "There was absolutely no detection that Kenny Rogers put anything on the ball. This was not an inspection, this was an observation. The umpires were very proactive. They asked that Kenny just clean that dirt off so there wouldn't be any question as to him with any foreign substance or dirt or whatever it may have been on the ball."

The people who commented on this post seem to think otherwise. Over the years, umpires haven't exactly been on top of doctored baseballs. After all, it was Frank Robinson, not the umpires, who caught Brendan Donnelly with pine tar on his glove.