American referee Sid Cassidy was caught on tape at the 2009 USA Swimming National Open Water Swimming Championships in Florida giving a yellow card to one of the swimmers.

The process of blowing a whistle, giving hand signals to the athletes, writing the swimmer’s number on the white board and reporting the infraction to the Chief Referee is rarely seen from shore or by spectators. However, the entire process can be seen below off the coast of Ft. Myers, Florida:

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