What Exactly Determines a Sack?

[KCrockaholic]

Originally Posted by theultimatekcchiefsfan

That happened today on the first game, and Phil pointed out that it was not a sack because, I believe it was McNabb, was in in a deliberate rushing play.

I had never heard that one before, but I trust Phil since he played that position all those years.

so how can they determine that it was a drawn up QB run and not just a blown play that the qb tries to scramble on? I dont see it being possible unless that ask the coach what play he was running, which just isnt gonna happen.