[mick]

Originally posted by David M
What's wrong with the tuck rule?

...It's existence. It's hard, fast and requires no judgment.

Under the rule, a quarterback's throwing motion begins when he raises the ball in his hand and begins to move his arm forward; that motion doesn't end until the quarterback tucks the ball back against his body, making him a runner. If the ball comes loose any time in between, it's an incomplete pass, not a fumble. Only if the quarterback reloads -- and raises the ball again to start a new throwing motion -- can he fumble, as long as the ball is knocked loose before his arm begins to move forward again.
mick