Officially the new NFL kickoff, tackling, replay rules will task adjusting referees
Briefly

The NFL's rule changes aim to enhance player safety during kickoffs and through the regulation of 'hip-drop' tackles, limiting dangerous on-field collisions.
The new kickoff format sees most players positioned closer together, which should result in fewer violent collisions. The league wants to make kickoffs safer.
Walt Anderson noted that many hip-drop tackles could occur without a flag because they are hard for officials to see during the game.
Anderson mentioned that while elements of hip-drop tackles were frequently found in preseason games, only two truly met the definition of a hip-drop tackle.
Read at Los Angeles Times
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