i just watched an Eagles defensive back turn to the ref to signal "no catch", while a Giants receiver, untouched, picked himself up off the ground and ran past him.
it seems that anymore, with no regard to what happened on the field or how bloody obviously a catch was made, the defense frantically turns to the refs to plead the case that there was no reception.
you would think that no receiver ever caught the ball, ever, according to the defense.
so why bother, defensive backs? when receivers and running backs complain to the refs that they've been facemasked, they typically have a case.
i say give it a rest.