From NFL.com
Whenever a team presents an apparent punting formation, defensive pass interference is not to be called for action on the end man on the line of scrimmage, or an eligible receiver behind the line of scrimmage who is aligned or in motion more than one yard outside the end man on the line. Defensive holding, such as tackling a receiver, still can be called and result in a 5-yard penalty and automatic first down from the previous spot, if accepted. Offensive pass interference rules still apply.
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