Don't worry John, he can't be DQ'ed. He didn't know he had incurred the penalty before the competition closed. The PGA Section still was showing him as the winner last time I looked. He can return the medal if he wants, but he can't be DQ'ed.
I was only going with what the article said:
Title: What would you do: teen golfer disqualifies self, gives up medal
From the article: Carrying an extra club is a two-stroke penalty per hole, but since Nash didn't account for those extra strokes, he signed what was, in effect, an incorrect scorecard, and thus would be disqualified from the tournament....Nash called the Wisconsin PGA, explained what had happened, and sent back the medal from the tournament. WPGA officials plan to present it to the tournament's runner-up.
So...