although I probably wont still be around, when they have some kind of way, possible in the chemical makeup of the stripes, to tell by way of an electronic device, when the ball has been moved 3 inches back from the line of scrimmage at the beginning of each play. At the same time, they would have some kind of way of electronically telling if an offensive player has scrossed the line before the ball moves back the 3 inches. Of course, a computer would compare the time on both to see which happened first.
Either that, or keep all presnap movement to be no closer than one yard from the line of scrimmage. That way, a ref could use his own judgement and hopefully could not fail to see if a player actually crossed the line of scrimmage before the ball moved. If a someone thought the player was actually within the 1 yard but clearly not across the line, it would be no big deal if not called.