Why not just use nuclear bombs first, then you can screen the ash after it cools.
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?"