Rule 2 – Section 19 – Article 3 – Crosses Neutral Zone
a. A legal forward pass has crossed the neutral zone when it first strikes the ground, a player, an official or anything beyond the neutral zone inbounds. It has not crossed the neutral zone when it first strikes the ground, a player, an official or anything in or behind the neutral zone inbounds.
b. A player has crossed the neutral zone if his entire body has been beyond the neutral zone.
c. A legal forward pass is beyond or behind the neutral zone where it crosses the sideline.