How could that be?
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He could have moved it to his cap, to his glove, under his arm, whatever. Not the first and won't be the last.
If you read the story, it explains that the umpires never saw anything on the balls that would suggest a substance was used.
He had some good stuff last night. The opposing team tried to throw him off his game. It didn't work.
And we all know that here in America, the legal principle is "guilty until proven innocent." </sarcasm>