MB, I posted this before but it is from the handbook, on face tackling. Notice it talks about using the top of the helmet.
Face Tackling
The danger in face tackling is greater to the tackler than his opponent because
the tackler’s head is often not in a protective, stable position when contact is made.
In these positions the cervical spine area is most vulnerable to injury. A blow to
the top of the head when the neck is in flexion may result in permanent injury. Face
tackling is defined as an act by a defensive player who initiates contact with a ball
carrier with the front of his helmet. Players must refrain from using this technique,
not only because it is costly to the team through a penalty of 15 yards, but also
because it is dangerous to the individual using the technique.
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