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Plus, why state athletic leagues may allow organized slap fighting, the states where it's legal for teachers to hit your child, and more.

New yorkUnited statesNew jerseyHunter campbellChris nowinskiAdrian petersonAl tompkinsDoug henryAmerican academy of pediatricsNevada gaming commissionAssociated pressAmerican psychological associationConcussion legacy foundationUnited nationsPower slap leagueShorenstein center on media