Passing

Any number of forward passes are allowed from behind the line of scrimmage. (Exception: a player cannot pass to himself/herself.) Once past the line of scrimmage, only backward passes are allowed. (Backward passes are allowed from any player to any player at any time, including "ineligible" linemen.)

An incomplete forward pass behind the line of scrimmage is considered a dead ball, an incomplete backwards pass, including a muffed snap, is a live ball.