One Small Question

If you are the defense, and the opposing QB lines up out wide for some kind of trick play, why doesn't your CB try to take his head off in the five yard chuck zone, where you can legally plant one on him?

Some fine day, some CB will do this -- heck, if it's me, I call up the FS and double-team him, and risk the 15 yard penalty -- and that will be the end of that little ploy. Quick.