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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The NFL estimated a 50% reduction in concussions among position groups using the Guardian caps the last two preseasons but Miller said the new helmets are as good or better than a Guardian cap on top of an older-style helmet.
NFL says moving the touchback on kickoffs to the 35 is 'not likely' this season
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