Associated Press
In this Thursday, Nov. 12, 2015, photo, Spenser Simmons, a referee with the North Texas Basketball Officials Association, stands ready during a break during a high school freshman girls basketball game in Allen, Texas. Violence against referees is as old as sport itself, and most are familiar with awful scenes from lower-division soccer matches in Europe and South America to peewee games and high school tournaments in the United States. This has come at a cost: By all accounts from those involved, finding and retaining referees is becoming more and more difficult. (AP Photo/LM Otero)

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