Rule 7 – Section 1 – Article 5 – Defensive Team Requirements
The defensive team requirements are as follows:
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a. Each of the following (1-5) is a dead-ball foul. Officials should blow the whistle and not allow the play to continue. After the ball is ready for play and before the ball is snapped:
- No player may enter the neutral zone threatening an offensive lineman and causing him to react immediately, or commit any other dead-ball offside foul (Rules 2-18-2 and 7-1-2-b-3 Exceptions). (A.R. 7-1-3:V) (A.R. 7-1-5:III)