I would guess a firearm of some sort, as that's the only thing I can think of that would: 1.) be relevant to a police investigation 2.) be registered or associ

I would guess a firearm of some sort, as that's the only thing I can think of that would: 1.) be relevant to a police investigation 2.) be registered or associated with individuals 3.) have few enough of an exact thing in an area for the manual checking to be effective