They have but one purpose, to get past metal detectors at places like airports or schools to hijack planes or shoot children.

Are you suggesting the deer have set up scanners by the blinds so you need these?

Are the geese hiding down at the airport?

Are the ducks camped out in the classrooms?

Is the burglar threatening your family carrying one of those stick metal detectors the old guys use at the beach when he breaks into your house? 

Why do you support these illegal guns, Ken? Why?