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Here is the full explanation from the NFL:
A "facemask" penalty is a judgment call that is not reviewable by replay.
Rule 12, Section 2, Article 5 of the NFL Rule Book (page 81) states that "no player shall twist, turn, or pull the facemask of an opponent in any direction."
The Rule Book describes the penalty as follows:
"Penalty: For twisting, turning or pulling the mask: loss of 15 yards. A personal foul. The player may be disqualified if the action is judged by the official(s) to be of a flagrant nature."
The Rule Book describes an approved ruling as it relates to facemask penalties (page 81).
"A.R. 12.12 - Third-and-10 on A30. Runner A1 runs to the A33, where he is tackled by B1, who incidentally grasps A1's facemask on the tackle, but it is not a twist, turn or pull. Ruling: A's ball, fourth-and-seven, on A33. No foul." |