Mike has very good coverage.
I believe that, as Mike said, you watch only the "important" linemen. Linemen that are "actively engaged" in the play. POINT OF ATTACK, that is no more than three down linemen. Your peripheral (sp) vision will catch big take downs, chop blocks or other infractions if not at the POA. Always concentrate on the POA, you will never hear anything more important from a U.
Also, I watch problem players a little closer. Defensive players are coached to work the U. They complain about holding each and every play, take most with a grain of salt. Sometimes, however, that one lineman will deserve a little extra attention. Let him know he is getting that attention and that will more than likely cause him refrain from any illegal activity and the rest of the linemen know you are watching also.
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