You are missing the point..
This is supposed to allow the cops to come and "knock" (yeah, I know its a lost concept) on your door.. rather than bashing it in and sticking a gun in your face..
It's a mayberry thing.. think about it like that..
Instead it would be more like.. (knock, knock.... Yes?)
"Hey.. I am the sherrif... I come here looking fer some drugs.. So, can I look around a bit, or do I need a Warrant?"