While we're on the topic of IS and IP...

[Bob Floyd]

Originally posted by Jim S
Nah Bob. None of those require a B player to be on his side of the LOS to Start the play.
2.8 defines encroachment (a place where no player can go)
2.24.3 only defines what is a defensive lineman, doesn't require anyone to be one.
7.16 again deals with encroachment. Again does not require that a B player be lined up on his side of the LOS, only that he not encroach the NZ.

A previous post stated that 7.2.5(a), Numbering requirements, was the only reference in the rules about where B could be. I was pointing out that there were other references and I still maintain they are all pertinent, although none of them relate to the original play in question. And I left out 3.7.6 which says an entering substitute shall be on his side of the neutral zone when the ball is snapped or free kicked. That's pretty clear. Now if you are going to say the player was not an entering substitute but one who was already in the game, then he also may not encroach. Take your pick of the rules making encroachment a foul.