Jeff Miller, who oversees player health and safety, said there have been no ACL or MCL injuries on kickoffs and only one concussion.
Roger Goodell says the league still reviewing latest claims against Deshaun Watson
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Miller said he was not concerned the penalties weren't called with the goal being eliminating them through warnings, educations and fines.
New rules led to more kickoff returns and no hip-drop tackle penalties in the preseason
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