Do you just want everyone to waltz on through without any checks at all?
What you mean like the baggage handlers and engineers do, perish the thought.
What is the point of screening with body scanners to make sure pointy things and blades bigger than 6cm are not
taken on board when such tools are already on board? (I am being vague here for obvious reasons.)
The world trade centre attacks would not have been stopped by body scanners, read all about it.