During a field goal or extra point attempt, the defensive team can't position any player on the line directly across from the snapper. Previously, a player needed to have his helmet outside the snapper's shoulder pads. Source: NFL.com
Since when has the Long Snapper been considered valuable enough to bend the rules to accomodate? This is the one thing that pisses me off about the NFL, how they bend the rules to manufacture how the game is played.